1e01402b1SRalf Baechle /* 2e01402b1SRalf Baechle * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved. 3e01402b1SRalf Baechle * 4e01402b1SRalf Baechle * This program is free software; you can distribute it and/or modify it 5e01402b1SRalf Baechle * under the terms of the GNU General Public License (Version 2) as 6e01402b1SRalf Baechle * published by the Free Software Foundation. 7e01402b1SRalf Baechle * 8e01402b1SRalf Baechle * This program is distributed in the hope it will be useful, but WITHOUT 9e01402b1SRalf Baechle * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10e01402b1SRalf Baechle * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11e01402b1SRalf Baechle * for more details. 12e01402b1SRalf Baechle * 13e01402b1SRalf Baechle * You should have received a copy of the GNU General Public License along 14e01402b1SRalf Baechle * with this program; if not, write to the Free Software Foundation, Inc., 15e01402b1SRalf Baechle * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 16e01402b1SRalf Baechle * 17e01402b1SRalf Baechle */ 18e01402b1SRalf Baechle 19e01402b1SRalf Baechle /* 20e01402b1SRalf Baechle * VPE support module 21e01402b1SRalf Baechle * 22e01402b1SRalf Baechle * Provides support for loading a MIPS SP program on VPE1. 23e01402b1SRalf Baechle * The SP enviroment is rather simple, no tlb's. It needs to be relocatable 24e01402b1SRalf Baechle * (or partially linked). You should initialise your stack in the startup 25e01402b1SRalf Baechle * code. This loader looks for the symbol __start and sets up 26e01402b1SRalf Baechle * execution to resume from there. The MIPS SDE kit contains suitable examples. 27e01402b1SRalf Baechle * 28e01402b1SRalf Baechle * To load and run, simply cat a SP 'program file' to /dev/vpe1. 29e01402b1SRalf Baechle * i.e cat spapp >/dev/vpe1. 30e01402b1SRalf Baechle * 31e01402b1SRalf Baechle * You'll need to have the following device files. 32e01402b1SRalf Baechle * mknod /dev/vpe0 c 63 0 33e01402b1SRalf Baechle * mknod /dev/vpe1 c 63 1 34e01402b1SRalf Baechle */ 35340ee4b9SRalf Baechle #include <linux/config.h> 36e01402b1SRalf Baechle #include <linux/kernel.h> 37e01402b1SRalf Baechle #include <linux/module.h> 38e01402b1SRalf Baechle #include <linux/fs.h> 39e01402b1SRalf Baechle #include <linux/init.h> 40e01402b1SRalf Baechle #include <asm/uaccess.h> 41e01402b1SRalf Baechle #include <linux/slab.h> 42e01402b1SRalf Baechle #include <linux/list.h> 43e01402b1SRalf Baechle #include <linux/vmalloc.h> 44e01402b1SRalf Baechle #include <linux/elf.h> 45e01402b1SRalf Baechle #include <linux/seq_file.h> 46e01402b1SRalf Baechle #include <linux/syscalls.h> 47e01402b1SRalf Baechle #include <linux/moduleloader.h> 48e01402b1SRalf Baechle #include <linux/interrupt.h> 49e01402b1SRalf Baechle #include <linux/poll.h> 50e01402b1SRalf Baechle #include <linux/bootmem.h> 51e01402b1SRalf Baechle #include <asm/mipsregs.h> 52340ee4b9SRalf Baechle #include <asm/mipsmtregs.h> 53e01402b1SRalf Baechle #include <asm/cacheflush.h> 54e01402b1SRalf Baechle #include <asm/atomic.h> 55e01402b1SRalf Baechle #include <asm/cpu.h> 56e01402b1SRalf Baechle #include <asm/processor.h> 57e01402b1SRalf Baechle #include <asm/system.h> 58e01402b1SRalf Baechle 59e01402b1SRalf Baechle typedef void *vpe_handle; 60e01402b1SRalf Baechle 61e01402b1SRalf Baechle // defined here because the kernel module loader doesn't have 62e01402b1SRalf Baechle // anything to do with it. 63e01402b1SRalf Baechle #define SHN_MIPS_SCOMMON 0xff03 64e01402b1SRalf Baechle 65e01402b1SRalf Baechle #ifndef ARCH_SHF_SMALL 66e01402b1SRalf Baechle #define ARCH_SHF_SMALL 0 67e01402b1SRalf Baechle #endif 68e01402b1SRalf Baechle 69e01402b1SRalf Baechle /* If this is set, the section belongs in the init part of the module */ 70e01402b1SRalf Baechle #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) 71e01402b1SRalf Baechle 72e01402b1SRalf Baechle // temp number, 73e01402b1SRalf Baechle #define VPE_MAJOR 63 74e01402b1SRalf Baechle 75e01402b1SRalf Baechle static char module_name[] = "vpe"; 76e01402b1SRalf Baechle static int major = 0; 77e01402b1SRalf Baechle 78e01402b1SRalf Baechle /* grab the likely amount of memory we will need. */ 79e01402b1SRalf Baechle #ifdef CONFIG_MIPS_VPE_LOADER_TOM 80e01402b1SRalf Baechle #define P_SIZE (2 * 1024 * 1024) 81e01402b1SRalf Baechle #else 82e01402b1SRalf Baechle /* add an overhead to the max kmalloc size for non-striped symbols/etc */ 83e01402b1SRalf Baechle #define P_SIZE (256 * 1024) 84e01402b1SRalf Baechle #endif 85e01402b1SRalf Baechle 86e01402b1SRalf Baechle #define MAX_VPES 16 87e01402b1SRalf Baechle 88e01402b1SRalf Baechle enum vpe_state { 89e01402b1SRalf Baechle VPE_STATE_UNUSED = 0, 90e01402b1SRalf Baechle VPE_STATE_INUSE, 91e01402b1SRalf Baechle VPE_STATE_RUNNING 92e01402b1SRalf Baechle }; 93e01402b1SRalf Baechle 94e01402b1SRalf Baechle enum tc_state { 95e01402b1SRalf Baechle TC_STATE_UNUSED = 0, 96e01402b1SRalf Baechle TC_STATE_INUSE, 97e01402b1SRalf Baechle TC_STATE_RUNNING, 98e01402b1SRalf Baechle TC_STATE_DYNAMIC 99e01402b1SRalf Baechle }; 100e01402b1SRalf Baechle 101e01402b1SRalf Baechle struct vpe; 102e01402b1SRalf Baechle typedef struct tc { 103e01402b1SRalf Baechle enum tc_state state; 104e01402b1SRalf Baechle int index; 105e01402b1SRalf Baechle 106e01402b1SRalf Baechle /* parent VPE */ 107e01402b1SRalf Baechle struct vpe *pvpe; 108e01402b1SRalf Baechle 109e01402b1SRalf Baechle /* The list of TC's with this VPE */ 110e01402b1SRalf Baechle struct list_head tc; 111e01402b1SRalf Baechle 112e01402b1SRalf Baechle /* The global list of tc's */ 113e01402b1SRalf Baechle struct list_head list; 114e01402b1SRalf Baechle } tc_t; 115e01402b1SRalf Baechle 116e01402b1SRalf Baechle typedef struct vpe { 117e01402b1SRalf Baechle enum vpe_state state; 118e01402b1SRalf Baechle 119e01402b1SRalf Baechle /* (device) minor associated with this vpe */ 120e01402b1SRalf Baechle int minor; 121e01402b1SRalf Baechle 122e01402b1SRalf Baechle /* elfloader stuff */ 123e01402b1SRalf Baechle void *load_addr; 124e01402b1SRalf Baechle u32 len; 125e01402b1SRalf Baechle char *pbuffer; 126e01402b1SRalf Baechle u32 plen; 127e01402b1SRalf Baechle 128e01402b1SRalf Baechle unsigned long __start; 129e01402b1SRalf Baechle 130e01402b1SRalf Baechle /* tc's associated with this vpe */ 131e01402b1SRalf Baechle struct list_head tc; 132e01402b1SRalf Baechle 133e01402b1SRalf Baechle /* The list of vpe's */ 134e01402b1SRalf Baechle struct list_head list; 135e01402b1SRalf Baechle 136e01402b1SRalf Baechle /* shared symbol address */ 137e01402b1SRalf Baechle void *shared_ptr; 138e01402b1SRalf Baechle } vpe_t; 139e01402b1SRalf Baechle 140e01402b1SRalf Baechle struct vpecontrol_ { 141e01402b1SRalf Baechle /* Virtual processing elements */ 142e01402b1SRalf Baechle struct list_head vpe_list; 143e01402b1SRalf Baechle 144e01402b1SRalf Baechle /* Thread contexts */ 145e01402b1SRalf Baechle struct list_head tc_list; 146e01402b1SRalf Baechle } vpecontrol; 147e01402b1SRalf Baechle 148e01402b1SRalf Baechle static void release_progmem(void *ptr); 149e01402b1SRalf Baechle static void dump_vpe(vpe_t * v); 150e01402b1SRalf Baechle extern void save_gp_address(unsigned int secbase, unsigned int rel); 151e01402b1SRalf Baechle 152e01402b1SRalf Baechle /* get the vpe associated with this minor */ 153e01402b1SRalf Baechle struct vpe *get_vpe(int minor) 154e01402b1SRalf Baechle { 155e01402b1SRalf Baechle struct vpe *v; 156e01402b1SRalf Baechle 157e01402b1SRalf Baechle list_for_each_entry(v, &vpecontrol.vpe_list, list) { 158e01402b1SRalf Baechle if (v->minor == minor) 159e01402b1SRalf Baechle return v; 160e01402b1SRalf Baechle } 161e01402b1SRalf Baechle 162e01402b1SRalf Baechle printk(KERN_DEBUG "VPE: get_vpe minor %d not found\n", minor); 163e01402b1SRalf Baechle return NULL; 164e01402b1SRalf Baechle } 165e01402b1SRalf Baechle 166e01402b1SRalf Baechle /* get the vpe associated with this minor */ 167e01402b1SRalf Baechle struct tc *get_tc(int index) 168e01402b1SRalf Baechle { 169e01402b1SRalf Baechle struct tc *t; 170e01402b1SRalf Baechle 171e01402b1SRalf Baechle list_for_each_entry(t, &vpecontrol.tc_list, list) { 172e01402b1SRalf Baechle if (t->index == index) 173e01402b1SRalf Baechle return t; 174e01402b1SRalf Baechle } 175e01402b1SRalf Baechle 176e01402b1SRalf Baechle printk(KERN_DEBUG "VPE: get_tc index %d not found\n", index); 177e01402b1SRalf Baechle 178e01402b1SRalf Baechle return NULL; 179e01402b1SRalf Baechle } 180e01402b1SRalf Baechle 181e01402b1SRalf Baechle struct tc *get_tc_unused(void) 182e01402b1SRalf Baechle { 183e01402b1SRalf Baechle struct tc *t; 184e01402b1SRalf Baechle 185e01402b1SRalf Baechle list_for_each_entry(t, &vpecontrol.tc_list, list) { 186e01402b1SRalf Baechle if (t->state == TC_STATE_UNUSED) 187e01402b1SRalf Baechle return t; 188e01402b1SRalf Baechle } 189e01402b1SRalf Baechle 190e01402b1SRalf Baechle printk(KERN_DEBUG "VPE: All TC's are in use\n"); 191e01402b1SRalf Baechle 192e01402b1SRalf Baechle return NULL; 193e01402b1SRalf Baechle } 194e01402b1SRalf Baechle 195e01402b1SRalf Baechle /* allocate a vpe and associate it with this minor (or index) */ 196e01402b1SRalf Baechle struct vpe *alloc_vpe(int minor) 197e01402b1SRalf Baechle { 198e01402b1SRalf Baechle struct vpe *v; 199e01402b1SRalf Baechle 200e01402b1SRalf Baechle if ((v = kmalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) { 201e01402b1SRalf Baechle printk(KERN_WARNING "VPE: alloc_vpe no mem\n"); 202e01402b1SRalf Baechle return NULL; 203e01402b1SRalf Baechle } 204e01402b1SRalf Baechle 205e01402b1SRalf Baechle memset(v, 0, sizeof(struct vpe)); 206e01402b1SRalf Baechle 207e01402b1SRalf Baechle INIT_LIST_HEAD(&v->tc); 208e01402b1SRalf Baechle list_add_tail(&v->list, &vpecontrol.vpe_list); 209e01402b1SRalf Baechle 210e01402b1SRalf Baechle v->minor = minor; 211e01402b1SRalf Baechle return v; 212e01402b1SRalf Baechle } 213e01402b1SRalf Baechle 214e01402b1SRalf Baechle /* allocate a tc. At startup only tc0 is running, all other can be halted. */ 215e01402b1SRalf Baechle struct tc *alloc_tc(int index) 216e01402b1SRalf Baechle { 217e01402b1SRalf Baechle struct tc *t; 218e01402b1SRalf Baechle 219e01402b1SRalf Baechle if ((t = kmalloc(sizeof(struct tc), GFP_KERNEL)) == NULL) { 220e01402b1SRalf Baechle printk(KERN_WARNING "VPE: alloc_tc no mem\n"); 221e01402b1SRalf Baechle return NULL; 222e01402b1SRalf Baechle } 223e01402b1SRalf Baechle 224e01402b1SRalf Baechle memset(t, 0, sizeof(struct tc)); 225e01402b1SRalf Baechle 226e01402b1SRalf Baechle INIT_LIST_HEAD(&t->tc); 227e01402b1SRalf Baechle list_add_tail(&t->list, &vpecontrol.tc_list); 228e01402b1SRalf Baechle 229e01402b1SRalf Baechle t->index = index; 230e01402b1SRalf Baechle 231e01402b1SRalf Baechle return t; 232e01402b1SRalf Baechle } 233e01402b1SRalf Baechle 234e01402b1SRalf Baechle /* clean up and free everything */ 235e01402b1SRalf Baechle void release_vpe(struct vpe *v) 236e01402b1SRalf Baechle { 237e01402b1SRalf Baechle list_del(&v->list); 238e01402b1SRalf Baechle if (v->load_addr) 239e01402b1SRalf Baechle release_progmem(v); 240e01402b1SRalf Baechle kfree(v); 241e01402b1SRalf Baechle } 242e01402b1SRalf Baechle 243e01402b1SRalf Baechle void dump_mtregs(void) 244e01402b1SRalf Baechle { 245e01402b1SRalf Baechle unsigned long val; 246e01402b1SRalf Baechle 247e01402b1SRalf Baechle val = read_c0_config3(); 248e01402b1SRalf Baechle printk("config3 0x%lx MT %ld\n", val, 249e01402b1SRalf Baechle (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT); 250e01402b1SRalf Baechle 251e01402b1SRalf Baechle val = read_c0_mvpconf0(); 252e01402b1SRalf Baechle printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val, 253e01402b1SRalf Baechle (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT, 254e01402b1SRalf Baechle val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT); 255e01402b1SRalf Baechle 256e01402b1SRalf Baechle val = read_c0_mvpcontrol(); 257e01402b1SRalf Baechle printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val, 258e01402b1SRalf Baechle (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT, 259e01402b1SRalf Baechle (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT, 260e01402b1SRalf Baechle (val & MVPCONTROL_EVP)); 261e01402b1SRalf Baechle 262e01402b1SRalf Baechle val = read_c0_vpeconf0(); 263e01402b1SRalf Baechle printk("VPEConf0 0x%lx MVP %ld\n", val, 264e01402b1SRalf Baechle (val & VPECONF0_MVP) >> VPECONF0_MVP_SHIFT); 265e01402b1SRalf Baechle } 266e01402b1SRalf Baechle 267e01402b1SRalf Baechle /* Find some VPE program space */ 268e01402b1SRalf Baechle static void *alloc_progmem(u32 len) 269e01402b1SRalf Baechle { 270e01402b1SRalf Baechle #ifdef CONFIG_MIPS_VPE_LOADER_TOM 271e01402b1SRalf Baechle /* this means you must tell linux to use less memory than you physically have */ 272e01402b1SRalf Baechle return (void *)((max_pfn * PAGE_SIZE) + KSEG0); 273e01402b1SRalf Baechle #else 274e01402b1SRalf Baechle // simple grab some mem for now 275e01402b1SRalf Baechle return kmalloc(len, GFP_KERNEL); 276e01402b1SRalf Baechle #endif 277e01402b1SRalf Baechle } 278e01402b1SRalf Baechle 279e01402b1SRalf Baechle static void release_progmem(void *ptr) 280e01402b1SRalf Baechle { 281e01402b1SRalf Baechle #ifndef CONFIG_MIPS_VPE_LOADER_TOM 282e01402b1SRalf Baechle kfree(ptr); 283e01402b1SRalf Baechle #endif 284e01402b1SRalf Baechle } 285e01402b1SRalf Baechle 286e01402b1SRalf Baechle /* Update size with this section: return offset. */ 287e01402b1SRalf Baechle static long get_offset(unsigned long *size, Elf_Shdr * sechdr) 288e01402b1SRalf Baechle { 289e01402b1SRalf Baechle long ret; 290e01402b1SRalf Baechle 291e01402b1SRalf Baechle ret = ALIGN(*size, sechdr->sh_addralign ? : 1); 292e01402b1SRalf Baechle *size = ret + sechdr->sh_size; 293e01402b1SRalf Baechle return ret; 294e01402b1SRalf Baechle } 295e01402b1SRalf Baechle 296e01402b1SRalf Baechle /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld 297e01402b1SRalf Baechle might -- code, read-only data, read-write data, small data. Tally 298e01402b1SRalf Baechle sizes, and place the offsets into sh_entsize fields: high bit means it 299e01402b1SRalf Baechle belongs in init. */ 300e01402b1SRalf Baechle static void layout_sections(struct module *mod, const Elf_Ehdr * hdr, 301e01402b1SRalf Baechle Elf_Shdr * sechdrs, const char *secstrings) 302e01402b1SRalf Baechle { 303e01402b1SRalf Baechle static unsigned long const masks[][2] = { 304e01402b1SRalf Baechle /* NOTE: all executable code must be the first section 305e01402b1SRalf Baechle * in this array; otherwise modify the text_size 306e01402b1SRalf Baechle * finder in the two loops below */ 307e01402b1SRalf Baechle {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL}, 308e01402b1SRalf Baechle {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL}, 309e01402b1SRalf Baechle {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL}, 310e01402b1SRalf Baechle {ARCH_SHF_SMALL | SHF_ALLOC, 0} 311e01402b1SRalf Baechle }; 312e01402b1SRalf Baechle unsigned int m, i; 313e01402b1SRalf Baechle 314e01402b1SRalf Baechle for (i = 0; i < hdr->e_shnum; i++) 315e01402b1SRalf Baechle sechdrs[i].sh_entsize = ~0UL; 316e01402b1SRalf Baechle 317e01402b1SRalf Baechle for (m = 0; m < ARRAY_SIZE(masks); ++m) { 318e01402b1SRalf Baechle for (i = 0; i < hdr->e_shnum; ++i) { 319e01402b1SRalf Baechle Elf_Shdr *s = &sechdrs[i]; 320e01402b1SRalf Baechle 321e01402b1SRalf Baechle // || strncmp(secstrings + s->sh_name, ".init", 5) == 0) 322e01402b1SRalf Baechle if ((s->sh_flags & masks[m][0]) != masks[m][0] 323e01402b1SRalf Baechle || (s->sh_flags & masks[m][1]) 324e01402b1SRalf Baechle || s->sh_entsize != ~0UL) 325e01402b1SRalf Baechle continue; 326e01402b1SRalf Baechle s->sh_entsize = get_offset(&mod->core_size, s); 327e01402b1SRalf Baechle } 328e01402b1SRalf Baechle 329e01402b1SRalf Baechle if (m == 0) 330e01402b1SRalf Baechle mod->core_text_size = mod->core_size; 331e01402b1SRalf Baechle 332e01402b1SRalf Baechle } 333e01402b1SRalf Baechle } 334e01402b1SRalf Baechle 335e01402b1SRalf Baechle 336e01402b1SRalf Baechle /* from module-elf32.c, but subverted a little */ 337e01402b1SRalf Baechle 338e01402b1SRalf Baechle struct mips_hi16 { 339e01402b1SRalf Baechle struct mips_hi16 *next; 340e01402b1SRalf Baechle Elf32_Addr *addr; 341e01402b1SRalf Baechle Elf32_Addr value; 342e01402b1SRalf Baechle }; 343e01402b1SRalf Baechle 344e01402b1SRalf Baechle static struct mips_hi16 *mips_hi16_list; 345e01402b1SRalf Baechle static unsigned int gp_offs, gp_addr; 346e01402b1SRalf Baechle 347e01402b1SRalf Baechle static int apply_r_mips_none(struct module *me, uint32_t *location, 348e01402b1SRalf Baechle Elf32_Addr v) 349e01402b1SRalf Baechle { 350e01402b1SRalf Baechle return 0; 351e01402b1SRalf Baechle } 352e01402b1SRalf Baechle 353e01402b1SRalf Baechle static int apply_r_mips_gprel16(struct module *me, uint32_t *location, 354e01402b1SRalf Baechle Elf32_Addr v) 355e01402b1SRalf Baechle { 356e01402b1SRalf Baechle int rel; 357e01402b1SRalf Baechle 358e01402b1SRalf Baechle if( !(*location & 0xffff) ) { 359e01402b1SRalf Baechle rel = (int)v - gp_addr; 360e01402b1SRalf Baechle } 361e01402b1SRalf Baechle else { 362e01402b1SRalf Baechle /* .sbss + gp(relative) + offset */ 363e01402b1SRalf Baechle /* kludge! */ 364e01402b1SRalf Baechle rel = (int)(short)((int)v + gp_offs + 365e01402b1SRalf Baechle (int)(short)(*location & 0xffff) - gp_addr); 366e01402b1SRalf Baechle } 367e01402b1SRalf Baechle 368e01402b1SRalf Baechle if( (rel > 32768) || (rel < -32768) ) { 369e01402b1SRalf Baechle printk(KERN_ERR 370e01402b1SRalf Baechle "apply_r_mips_gprel16: relative address out of range 0x%x %d\n", 371e01402b1SRalf Baechle rel, rel); 372e01402b1SRalf Baechle return -ENOEXEC; 373e01402b1SRalf Baechle } 374e01402b1SRalf Baechle 375e01402b1SRalf Baechle *location = (*location & 0xffff0000) | (rel & 0xffff); 376e01402b1SRalf Baechle 377e01402b1SRalf Baechle return 0; 378e01402b1SRalf Baechle } 379e01402b1SRalf Baechle 380e01402b1SRalf Baechle static int apply_r_mips_pc16(struct module *me, uint32_t *location, 381e01402b1SRalf Baechle Elf32_Addr v) 382e01402b1SRalf Baechle { 383e01402b1SRalf Baechle int rel; 384e01402b1SRalf Baechle rel = (((unsigned int)v - (unsigned int)location)); 385e01402b1SRalf Baechle rel >>= 2; // because the offset is in _instructions_ not bytes. 386e01402b1SRalf Baechle rel -= 1; // and one instruction less due to the branch delay slot. 387e01402b1SRalf Baechle 388e01402b1SRalf Baechle if( (rel > 32768) || (rel < -32768) ) { 389e01402b1SRalf Baechle printk(KERN_ERR 390e01402b1SRalf Baechle "apply_r_mips_pc16: relative address out of range 0x%x\n", rel); 391e01402b1SRalf Baechle return -ENOEXEC; 392e01402b1SRalf Baechle } 393e01402b1SRalf Baechle 394e01402b1SRalf Baechle *location = (*location & 0xffff0000) | (rel & 0xffff); 395e01402b1SRalf Baechle 396e01402b1SRalf Baechle return 0; 397e01402b1SRalf Baechle } 398e01402b1SRalf Baechle 399e01402b1SRalf Baechle static int apply_r_mips_32(struct module *me, uint32_t *location, 400e01402b1SRalf Baechle Elf32_Addr v) 401e01402b1SRalf Baechle { 402e01402b1SRalf Baechle *location += v; 403e01402b1SRalf Baechle 404e01402b1SRalf Baechle return 0; 405e01402b1SRalf Baechle } 406e01402b1SRalf Baechle 407e01402b1SRalf Baechle static int apply_r_mips_26(struct module *me, uint32_t *location, 408e01402b1SRalf Baechle Elf32_Addr v) 409e01402b1SRalf Baechle { 410e01402b1SRalf Baechle if (v % 4) { 411e01402b1SRalf Baechle printk(KERN_ERR "module %s: dangerous relocation mod4\n", me->name); 412e01402b1SRalf Baechle return -ENOEXEC; 413e01402b1SRalf Baechle } 414e01402b1SRalf Baechle 415e01402b1SRalf Baechle /* Not desperately convinced this is a good check of an overflow condition 416e01402b1SRalf Baechle anyway. But it gets in the way of handling undefined weak symbols which 417e01402b1SRalf Baechle we want to set to zero. 418e01402b1SRalf Baechle if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { 419e01402b1SRalf Baechle printk(KERN_ERR 420e01402b1SRalf Baechle "module %s: relocation overflow\n", 421e01402b1SRalf Baechle me->name); 422e01402b1SRalf Baechle return -ENOEXEC; 423e01402b1SRalf Baechle } 424e01402b1SRalf Baechle */ 425e01402b1SRalf Baechle 426e01402b1SRalf Baechle *location = (*location & ~0x03ffffff) | 427e01402b1SRalf Baechle ((*location + (v >> 2)) & 0x03ffffff); 428e01402b1SRalf Baechle return 0; 429e01402b1SRalf Baechle } 430e01402b1SRalf Baechle 431e01402b1SRalf Baechle static int apply_r_mips_hi16(struct module *me, uint32_t *location, 432e01402b1SRalf Baechle Elf32_Addr v) 433e01402b1SRalf Baechle { 434e01402b1SRalf Baechle struct mips_hi16 *n; 435e01402b1SRalf Baechle 436e01402b1SRalf Baechle /* 437e01402b1SRalf Baechle * We cannot relocate this one now because we don't know the value of 438e01402b1SRalf Baechle * the carry we need to add. Save the information, and let LO16 do the 439e01402b1SRalf Baechle * actual relocation. 440e01402b1SRalf Baechle */ 441e01402b1SRalf Baechle n = kmalloc(sizeof *n, GFP_KERNEL); 442e01402b1SRalf Baechle if (!n) 443e01402b1SRalf Baechle return -ENOMEM; 444e01402b1SRalf Baechle 445e01402b1SRalf Baechle n->addr = location; 446e01402b1SRalf Baechle n->value = v; 447e01402b1SRalf Baechle n->next = mips_hi16_list; 448e01402b1SRalf Baechle mips_hi16_list = n; 449e01402b1SRalf Baechle 450e01402b1SRalf Baechle return 0; 451e01402b1SRalf Baechle } 452e01402b1SRalf Baechle 453e01402b1SRalf Baechle static int apply_r_mips_lo16(struct module *me, uint32_t *location, 454e01402b1SRalf Baechle Elf32_Addr v) 455e01402b1SRalf Baechle { 456e01402b1SRalf Baechle unsigned long insnlo = *location; 457e01402b1SRalf Baechle Elf32_Addr val, vallo; 458e01402b1SRalf Baechle 459e01402b1SRalf Baechle /* Sign extend the addend we extract from the lo insn. */ 460e01402b1SRalf Baechle vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; 461e01402b1SRalf Baechle 462e01402b1SRalf Baechle if (mips_hi16_list != NULL) { 463e01402b1SRalf Baechle struct mips_hi16 *l; 464e01402b1SRalf Baechle 465e01402b1SRalf Baechle l = mips_hi16_list; 466e01402b1SRalf Baechle while (l != NULL) { 467e01402b1SRalf Baechle struct mips_hi16 *next; 468e01402b1SRalf Baechle unsigned long insn; 469e01402b1SRalf Baechle 470e01402b1SRalf Baechle /* 471e01402b1SRalf Baechle * The value for the HI16 had best be the same. 472e01402b1SRalf Baechle */ 473e01402b1SRalf Baechle if (v != l->value) { 474e01402b1SRalf Baechle printk("%d != %d\n", v, l->value); 475e01402b1SRalf Baechle goto out_danger; 476e01402b1SRalf Baechle } 477e01402b1SRalf Baechle 478e01402b1SRalf Baechle 479e01402b1SRalf Baechle /* 480e01402b1SRalf Baechle * Do the HI16 relocation. Note that we actually don't 481e01402b1SRalf Baechle * need to know anything about the LO16 itself, except 482e01402b1SRalf Baechle * where to find the low 16 bits of the addend needed 483e01402b1SRalf Baechle * by the LO16. 484e01402b1SRalf Baechle */ 485e01402b1SRalf Baechle insn = *l->addr; 486e01402b1SRalf Baechle val = ((insn & 0xffff) << 16) + vallo; 487e01402b1SRalf Baechle val += v; 488e01402b1SRalf Baechle 489e01402b1SRalf Baechle /* 490e01402b1SRalf Baechle * Account for the sign extension that will happen in 491e01402b1SRalf Baechle * the low bits. 492e01402b1SRalf Baechle */ 493e01402b1SRalf Baechle val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff; 494e01402b1SRalf Baechle 495e01402b1SRalf Baechle insn = (insn & ~0xffff) | val; 496e01402b1SRalf Baechle *l->addr = insn; 497e01402b1SRalf Baechle 498e01402b1SRalf Baechle next = l->next; 499e01402b1SRalf Baechle kfree(l); 500e01402b1SRalf Baechle l = next; 501e01402b1SRalf Baechle } 502e01402b1SRalf Baechle 503e01402b1SRalf Baechle mips_hi16_list = NULL; 504e01402b1SRalf Baechle } 505e01402b1SRalf Baechle 506e01402b1SRalf Baechle /* 507e01402b1SRalf Baechle * Ok, we're done with the HI16 relocs. Now deal with the LO16. 508e01402b1SRalf Baechle */ 509e01402b1SRalf Baechle val = v + vallo; 510e01402b1SRalf Baechle insnlo = (insnlo & ~0xffff) | (val & 0xffff); 511e01402b1SRalf Baechle *location = insnlo; 512e01402b1SRalf Baechle 513e01402b1SRalf Baechle return 0; 514e01402b1SRalf Baechle 515e01402b1SRalf Baechle out_danger: 516e01402b1SRalf Baechle printk(KERN_ERR "module %s: dangerous " "relocation\n", me->name); 517e01402b1SRalf Baechle 518e01402b1SRalf Baechle return -ENOEXEC; 519e01402b1SRalf Baechle } 520e01402b1SRalf Baechle 521e01402b1SRalf Baechle static int (*reloc_handlers[]) (struct module *me, uint32_t *location, 522e01402b1SRalf Baechle Elf32_Addr v) = { 523e01402b1SRalf Baechle [R_MIPS_NONE] = apply_r_mips_none, 524e01402b1SRalf Baechle [R_MIPS_32] = apply_r_mips_32, 525e01402b1SRalf Baechle [R_MIPS_26] = apply_r_mips_26, 526e01402b1SRalf Baechle [R_MIPS_HI16] = apply_r_mips_hi16, 527e01402b1SRalf Baechle [R_MIPS_LO16] = apply_r_mips_lo16, 528e01402b1SRalf Baechle [R_MIPS_GPREL16] = apply_r_mips_gprel16, 529e01402b1SRalf Baechle [R_MIPS_PC16] = apply_r_mips_pc16 530e01402b1SRalf Baechle }; 531e01402b1SRalf Baechle 532e01402b1SRalf Baechle 533e01402b1SRalf Baechle int apply_relocations(Elf32_Shdr *sechdrs, 534e01402b1SRalf Baechle const char *strtab, 535e01402b1SRalf Baechle unsigned int symindex, 536e01402b1SRalf Baechle unsigned int relsec, 537e01402b1SRalf Baechle struct module *me) 538e01402b1SRalf Baechle { 539e01402b1SRalf Baechle Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr; 540e01402b1SRalf Baechle Elf32_Sym *sym; 541e01402b1SRalf Baechle uint32_t *location; 542e01402b1SRalf Baechle unsigned int i; 543e01402b1SRalf Baechle Elf32_Addr v; 544e01402b1SRalf Baechle int res; 545e01402b1SRalf Baechle 546e01402b1SRalf Baechle for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 547e01402b1SRalf Baechle Elf32_Word r_info = rel[i].r_info; 548e01402b1SRalf Baechle 549e01402b1SRalf Baechle /* This is where to make the change */ 550e01402b1SRalf Baechle location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 551e01402b1SRalf Baechle + rel[i].r_offset; 552e01402b1SRalf Baechle /* This is the symbol it is referring to */ 553e01402b1SRalf Baechle sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 554e01402b1SRalf Baechle + ELF32_R_SYM(r_info); 555e01402b1SRalf Baechle 556e01402b1SRalf Baechle if (!sym->st_value) { 557e01402b1SRalf Baechle printk(KERN_DEBUG "%s: undefined weak symbol %s\n", 558e01402b1SRalf Baechle me->name, strtab + sym->st_name); 559e01402b1SRalf Baechle /* just print the warning, dont barf */ 560e01402b1SRalf Baechle } 561e01402b1SRalf Baechle 562e01402b1SRalf Baechle v = sym->st_value; 563e01402b1SRalf Baechle 564e01402b1SRalf Baechle res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v); 565e01402b1SRalf Baechle if( res ) { 566e01402b1SRalf Baechle printk(KERN_DEBUG 567e01402b1SRalf Baechle "relocation error 0x%x sym refer <%s> value 0x%x " 568e01402b1SRalf Baechle "type 0x%x r_info 0x%x\n", 569e01402b1SRalf Baechle (unsigned int)location, strtab + sym->st_name, v, 570e01402b1SRalf Baechle r_info, ELF32_R_TYPE(r_info)); 571e01402b1SRalf Baechle } 572e01402b1SRalf Baechle 573e01402b1SRalf Baechle if (res) 574e01402b1SRalf Baechle return res; 575e01402b1SRalf Baechle } 576e01402b1SRalf Baechle 577e01402b1SRalf Baechle return 0; 578e01402b1SRalf Baechle } 579e01402b1SRalf Baechle 580e01402b1SRalf Baechle void save_gp_address(unsigned int secbase, unsigned int rel) 581e01402b1SRalf Baechle { 582e01402b1SRalf Baechle gp_addr = secbase + rel; 583e01402b1SRalf Baechle gp_offs = gp_addr - (secbase & 0xffff0000); 584e01402b1SRalf Baechle } 585e01402b1SRalf Baechle /* end module-elf32.c */ 586e01402b1SRalf Baechle 587e01402b1SRalf Baechle 588e01402b1SRalf Baechle 589e01402b1SRalf Baechle /* Change all symbols so that sh_value encodes the pointer directly. */ 590e01402b1SRalf Baechle static int simplify_symbols(Elf_Shdr * sechdrs, 591e01402b1SRalf Baechle unsigned int symindex, 592e01402b1SRalf Baechle const char *strtab, 593e01402b1SRalf Baechle const char *secstrings, 594e01402b1SRalf Baechle unsigned int nsecs, struct module *mod) 595e01402b1SRalf Baechle { 596e01402b1SRalf Baechle Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; 597e01402b1SRalf Baechle unsigned long secbase, bssbase = 0; 598e01402b1SRalf Baechle unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); 599e01402b1SRalf Baechle int ret = 0, size; 600e01402b1SRalf Baechle 601e01402b1SRalf Baechle /* find the .bss section for COMMON symbols */ 602e01402b1SRalf Baechle for (i = 0; i < nsecs; i++) { 603e01402b1SRalf Baechle if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) 604e01402b1SRalf Baechle bssbase = sechdrs[i].sh_addr; 605e01402b1SRalf Baechle } 606e01402b1SRalf Baechle 607e01402b1SRalf Baechle for (i = 1; i < n; i++) { 608e01402b1SRalf Baechle switch (sym[i].st_shndx) { 609e01402b1SRalf Baechle case SHN_COMMON: 610e01402b1SRalf Baechle /* Allocate space for the symbol in the .bss section. st_value is currently size. 611e01402b1SRalf Baechle We want it to have the address of the symbol. */ 612e01402b1SRalf Baechle 613e01402b1SRalf Baechle size = sym[i].st_value; 614e01402b1SRalf Baechle sym[i].st_value = bssbase; 615e01402b1SRalf Baechle 616e01402b1SRalf Baechle bssbase += size; 617e01402b1SRalf Baechle break; 618e01402b1SRalf Baechle 619e01402b1SRalf Baechle case SHN_ABS: 620e01402b1SRalf Baechle /* Don't need to do anything */ 621e01402b1SRalf Baechle break; 622e01402b1SRalf Baechle 623e01402b1SRalf Baechle case SHN_UNDEF: 624e01402b1SRalf Baechle /* ret = -ENOENT; */ 625e01402b1SRalf Baechle break; 626e01402b1SRalf Baechle 627e01402b1SRalf Baechle case SHN_MIPS_SCOMMON: 628e01402b1SRalf Baechle 629e01402b1SRalf Baechle printk(KERN_DEBUG 630e01402b1SRalf Baechle "simplify_symbols: ignoring SHN_MIPS_SCOMMON symbol <%s> st_shndx %d\n", 631e01402b1SRalf Baechle strtab + sym[i].st_name, sym[i].st_shndx); 632e01402b1SRalf Baechle 633e01402b1SRalf Baechle // .sbss section 634e01402b1SRalf Baechle break; 635e01402b1SRalf Baechle 636e01402b1SRalf Baechle default: 637e01402b1SRalf Baechle secbase = sechdrs[sym[i].st_shndx].sh_addr; 638e01402b1SRalf Baechle 639e01402b1SRalf Baechle if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) { 640e01402b1SRalf Baechle save_gp_address(secbase, sym[i].st_value); 641e01402b1SRalf Baechle } 642e01402b1SRalf Baechle 643e01402b1SRalf Baechle sym[i].st_value += secbase; 644e01402b1SRalf Baechle break; 645e01402b1SRalf Baechle } 646e01402b1SRalf Baechle 647e01402b1SRalf Baechle } 648e01402b1SRalf Baechle 649e01402b1SRalf Baechle return ret; 650e01402b1SRalf Baechle } 651e01402b1SRalf Baechle 652e01402b1SRalf Baechle #ifdef DEBUG_ELFLOADER 653e01402b1SRalf Baechle static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex, 654e01402b1SRalf Baechle const char *strtab, struct module *mod) 655e01402b1SRalf Baechle { 656e01402b1SRalf Baechle Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; 657e01402b1SRalf Baechle unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); 658e01402b1SRalf Baechle 659e01402b1SRalf Baechle printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n); 660e01402b1SRalf Baechle for (i = 1; i < n; i++) { 661e01402b1SRalf Baechle printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i, 662e01402b1SRalf Baechle strtab + sym[i].st_name, sym[i].st_value); 663e01402b1SRalf Baechle } 664e01402b1SRalf Baechle } 665e01402b1SRalf Baechle #endif 666e01402b1SRalf Baechle 667e01402b1SRalf Baechle static void dump_tc(struct tc *t) 668e01402b1SRalf Baechle { 669e01402b1SRalf Baechle printk(KERN_WARNING "VPE: TC index %d TCStatus 0x%lx halt 0x%lx\n", 670e01402b1SRalf Baechle t->index, read_tc_c0_tcstatus(), read_tc_c0_tchalt()); 671e01402b1SRalf Baechle printk(KERN_WARNING "VPE: tcrestart 0x%lx\n", read_tc_c0_tcrestart()); 672e01402b1SRalf Baechle } 673e01402b1SRalf Baechle 674e01402b1SRalf Baechle static void dump_tclist(void) 675e01402b1SRalf Baechle { 676e01402b1SRalf Baechle struct tc *t; 677e01402b1SRalf Baechle 678e01402b1SRalf Baechle list_for_each_entry(t, &vpecontrol.tc_list, list) { 679e01402b1SRalf Baechle dump_tc(t); 680e01402b1SRalf Baechle } 681e01402b1SRalf Baechle } 682e01402b1SRalf Baechle 683e01402b1SRalf Baechle /* We are prepared so configure and start the VPE... */ 684e01402b1SRalf Baechle int vpe_run(vpe_t * v) 685e01402b1SRalf Baechle { 686e01402b1SRalf Baechle unsigned long val; 687e01402b1SRalf Baechle struct tc *t; 688e01402b1SRalf Baechle 689e01402b1SRalf Baechle /* check we are the Master VPE */ 690e01402b1SRalf Baechle val = read_c0_vpeconf0(); 691e01402b1SRalf Baechle if (!(val & VPECONF0_MVP)) { 692e01402b1SRalf Baechle printk(KERN_WARNING 693e01402b1SRalf Baechle "VPE: only Master VPE's are allowed to configure MT\n"); 694e01402b1SRalf Baechle return -1; 695e01402b1SRalf Baechle } 696e01402b1SRalf Baechle 697e01402b1SRalf Baechle /* disable MT (using dvpe) */ 698e01402b1SRalf Baechle dvpe(); 699e01402b1SRalf Baechle 700e01402b1SRalf Baechle /* Put MVPE's into 'configuration state' */ 701340ee4b9SRalf Baechle set_c0_mvpcontrol(MVPCONTROL_VPC); 702e01402b1SRalf Baechle 703e01402b1SRalf Baechle if (!list_empty(&v->tc)) { 704e01402b1SRalf Baechle if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) { 705e01402b1SRalf Baechle printk(KERN_WARNING "VPE: TC %d is already in use.\n", 706e01402b1SRalf Baechle t->index); 707e01402b1SRalf Baechle return -ENOEXEC; 708e01402b1SRalf Baechle } 709e01402b1SRalf Baechle } else { 710e01402b1SRalf Baechle printk(KERN_WARNING "VPE: No TC's associated with VPE %d\n", 711e01402b1SRalf Baechle v->minor); 712e01402b1SRalf Baechle return -ENOEXEC; 713e01402b1SRalf Baechle } 714e01402b1SRalf Baechle 715e01402b1SRalf Baechle settc(t->index); 716e01402b1SRalf Baechle 717e01402b1SRalf Baechle val = read_vpe_c0_vpeconf0(); 718e01402b1SRalf Baechle 719e01402b1SRalf Baechle /* should check it is halted, and not activated */ 720e01402b1SRalf Baechle if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) { 721e01402b1SRalf Baechle printk(KERN_WARNING "VPE: TC %d is already doing something!\n", 722e01402b1SRalf Baechle t->index); 723e01402b1SRalf Baechle 724e01402b1SRalf Baechle dump_tclist(); 725e01402b1SRalf Baechle return -ENOEXEC; 726e01402b1SRalf Baechle } 727e01402b1SRalf Baechle 728e01402b1SRalf Baechle /* Write the address we want it to start running from in the TCPC register. */ 729e01402b1SRalf Baechle write_tc_c0_tcrestart((unsigned long)v->__start); 730e01402b1SRalf Baechle 731e01402b1SRalf Baechle /* write the sivc_info address to tccontext */ 732e01402b1SRalf Baechle write_tc_c0_tccontext((unsigned long)0); 733e01402b1SRalf Baechle 734e01402b1SRalf Baechle /* Set up the XTC bit in vpeconf0 to point at our tc */ 735e01402b1SRalf Baechle write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (t->index << VPECONF0_XTC_SHIFT)); 736e01402b1SRalf Baechle 737e01402b1SRalf Baechle /* mark the TC as activated, not interrupt exempt and not dynamically allocatable */ 738e01402b1SRalf Baechle val = read_tc_c0_tcstatus(); 739e01402b1SRalf Baechle val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A; 740e01402b1SRalf Baechle write_tc_c0_tcstatus(val); 741e01402b1SRalf Baechle 742e01402b1SRalf Baechle write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H); 743e01402b1SRalf Baechle 744e01402b1SRalf Baechle /* set up VPE1 */ 745e01402b1SRalf Baechle write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); // no multiple TC's 746e01402b1SRalf Baechle write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA); // enable this VPE 747e01402b1SRalf Baechle 748e01402b1SRalf Baechle /* 749e01402b1SRalf Baechle * The sde-kit passes 'memsize' to __start in $a3, so set something 750e01402b1SRalf Baechle * here... 751e01402b1SRalf Baechle * Or set $a3 (register 7) to zero and define DFLT_STACK_SIZE and 752e01402b1SRalf Baechle * DFLT_HEAP_SIZE when you compile your program 753e01402b1SRalf Baechle */ 754e01402b1SRalf Baechle 755e01402b1SRalf Baechle mttgpr(7, 0); 756e01402b1SRalf Baechle 757e01402b1SRalf Baechle /* set config to be the same as vpe0, particularly kseg0 coherency alg */ 758e01402b1SRalf Baechle write_vpe_c0_config(read_c0_config()); 759e01402b1SRalf Baechle 760e01402b1SRalf Baechle /* clear out any left overs from a previous program */ 761e01402b1SRalf Baechle write_vpe_c0_cause(0); 762e01402b1SRalf Baechle 763e01402b1SRalf Baechle /* take system out of configuration state */ 764340ee4b9SRalf Baechle clear_c0_mvpcontrol(MVPCONTROL_VPC); 765e01402b1SRalf Baechle 766e01402b1SRalf Baechle /* clear interrupts enabled IE, ERL, EXL, and KSU from c0 status */ 767e01402b1SRalf Baechle write_vpe_c0_status(read_vpe_c0_status() & ~(ST0_ERL | ST0_KSU | ST0_IE | ST0_EXL)); 768e01402b1SRalf Baechle 769e01402b1SRalf Baechle /* set it running */ 770e01402b1SRalf Baechle evpe(EVPE_ENABLE); 771e01402b1SRalf Baechle 772e01402b1SRalf Baechle return 0; 773e01402b1SRalf Baechle } 774e01402b1SRalf Baechle 775e01402b1SRalf Baechle static unsigned long find_vpe_symbols(vpe_t * v, Elf_Shdr * sechdrs, 776e01402b1SRalf Baechle unsigned int symindex, const char *strtab, 777e01402b1SRalf Baechle struct module *mod) 778e01402b1SRalf Baechle { 779e01402b1SRalf Baechle Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; 780e01402b1SRalf Baechle unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); 781e01402b1SRalf Baechle 782e01402b1SRalf Baechle for (i = 1; i < n; i++) { 783e01402b1SRalf Baechle if (strcmp(strtab + sym[i].st_name, "__start") == 0) { 784e01402b1SRalf Baechle v->__start = sym[i].st_value; 785e01402b1SRalf Baechle } 786e01402b1SRalf Baechle 787e01402b1SRalf Baechle if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) { 788e01402b1SRalf Baechle v->shared_ptr = (void *)sym[i].st_value; 789e01402b1SRalf Baechle } 790e01402b1SRalf Baechle } 791e01402b1SRalf Baechle 792e01402b1SRalf Baechle return 0; 793e01402b1SRalf Baechle } 794e01402b1SRalf Baechle 795e01402b1SRalf Baechle /* Allocates a VPE with some program code space(the load address), copies the contents 796e01402b1SRalf Baechle of the program (p)buffer performing relocatations/etc, free's it when finished. 797e01402b1SRalf Baechle */ 798e01402b1SRalf Baechle int vpe_elfload(vpe_t * v) 799e01402b1SRalf Baechle { 800e01402b1SRalf Baechle Elf_Ehdr *hdr; 801e01402b1SRalf Baechle Elf_Shdr *sechdrs; 802e01402b1SRalf Baechle long err = 0; 803e01402b1SRalf Baechle char *secstrings, *strtab = NULL; 804e01402b1SRalf Baechle unsigned int len, i, symindex = 0, strindex = 0; 805e01402b1SRalf Baechle 806e01402b1SRalf Baechle struct module mod; // so we can re-use the relocations code 807e01402b1SRalf Baechle 808e01402b1SRalf Baechle memset(&mod, 0, sizeof(struct module)); 809e01402b1SRalf Baechle strcpy(mod.name, "VPE dummy prog module"); 810e01402b1SRalf Baechle 811e01402b1SRalf Baechle hdr = (Elf_Ehdr *) v->pbuffer; 812e01402b1SRalf Baechle len = v->plen; 813e01402b1SRalf Baechle 814e01402b1SRalf Baechle /* Sanity checks against insmoding binaries or wrong arch, 815e01402b1SRalf Baechle weird elf version */ 816e01402b1SRalf Baechle if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 817e01402b1SRalf Baechle || hdr->e_type != ET_REL || !elf_check_arch(hdr) 818e01402b1SRalf Baechle || hdr->e_shentsize != sizeof(*sechdrs)) { 819e01402b1SRalf Baechle printk(KERN_WARNING 820e01402b1SRalf Baechle "VPE program, wrong arch or weird elf version\n"); 821e01402b1SRalf Baechle 822e01402b1SRalf Baechle return -ENOEXEC; 823e01402b1SRalf Baechle } 824e01402b1SRalf Baechle 825e01402b1SRalf Baechle if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { 826e01402b1SRalf Baechle printk(KERN_ERR "VPE program length %u truncated\n", len); 827e01402b1SRalf Baechle return -ENOEXEC; 828e01402b1SRalf Baechle } 829e01402b1SRalf Baechle 830e01402b1SRalf Baechle /* Convenience variables */ 831e01402b1SRalf Baechle sechdrs = (void *)hdr + hdr->e_shoff; 832e01402b1SRalf Baechle secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 833e01402b1SRalf Baechle sechdrs[0].sh_addr = 0; 834e01402b1SRalf Baechle 835e01402b1SRalf Baechle /* And these should exist, but gcc whinges if we don't init them */ 836e01402b1SRalf Baechle symindex = strindex = 0; 837e01402b1SRalf Baechle 838e01402b1SRalf Baechle for (i = 1; i < hdr->e_shnum; i++) { 839e01402b1SRalf Baechle 840e01402b1SRalf Baechle if (sechdrs[i].sh_type != SHT_NOBITS 841e01402b1SRalf Baechle && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) { 842e01402b1SRalf Baechle printk(KERN_ERR "VPE program length %u truncated\n", 843e01402b1SRalf Baechle len); 844e01402b1SRalf Baechle return -ENOEXEC; 845e01402b1SRalf Baechle } 846e01402b1SRalf Baechle 847e01402b1SRalf Baechle /* Mark all sections sh_addr with their address in the 848e01402b1SRalf Baechle temporary image. */ 849e01402b1SRalf Baechle sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset; 850e01402b1SRalf Baechle 851e01402b1SRalf Baechle /* Internal symbols and strings. */ 852e01402b1SRalf Baechle if (sechdrs[i].sh_type == SHT_SYMTAB) { 853e01402b1SRalf Baechle symindex = i; 854e01402b1SRalf Baechle strindex = sechdrs[i].sh_link; 855e01402b1SRalf Baechle strtab = (char *)hdr + sechdrs[strindex].sh_offset; 856e01402b1SRalf Baechle } 857e01402b1SRalf Baechle } 858e01402b1SRalf Baechle 859e01402b1SRalf Baechle layout_sections(&mod, hdr, sechdrs, secstrings); 860e01402b1SRalf Baechle 861e01402b1SRalf Baechle v->load_addr = alloc_progmem(mod.core_size); 862e01402b1SRalf Baechle memset(v->load_addr, 0, mod.core_size); 863e01402b1SRalf Baechle 864e01402b1SRalf Baechle printk("VPE elf_loader: loading to %p\n", v->load_addr); 865e01402b1SRalf Baechle 866e01402b1SRalf Baechle for (i = 0; i < hdr->e_shnum; i++) { 867e01402b1SRalf Baechle void *dest; 868e01402b1SRalf Baechle 869e01402b1SRalf Baechle if (!(sechdrs[i].sh_flags & SHF_ALLOC)) 870e01402b1SRalf Baechle continue; 871e01402b1SRalf Baechle 872e01402b1SRalf Baechle dest = v->load_addr + sechdrs[i].sh_entsize; 873e01402b1SRalf Baechle 874e01402b1SRalf Baechle if (sechdrs[i].sh_type != SHT_NOBITS) 875e01402b1SRalf Baechle memcpy(dest, (void *)sechdrs[i].sh_addr, 876e01402b1SRalf Baechle sechdrs[i].sh_size); 877e01402b1SRalf Baechle /* Update sh_addr to point to copy in image. */ 878e01402b1SRalf Baechle sechdrs[i].sh_addr = (unsigned long)dest; 879e01402b1SRalf Baechle } 880e01402b1SRalf Baechle 881e01402b1SRalf Baechle /* Fix up syms, so that st_value is a pointer to location. */ 882e01402b1SRalf Baechle err = 883e01402b1SRalf Baechle simplify_symbols(sechdrs, symindex, strtab, secstrings, 884e01402b1SRalf Baechle hdr->e_shnum, &mod); 885e01402b1SRalf Baechle if (err < 0) { 886e01402b1SRalf Baechle printk(KERN_WARNING "VPE: unable to simplify symbols\n"); 887e01402b1SRalf Baechle goto cleanup; 888e01402b1SRalf Baechle } 889e01402b1SRalf Baechle 890e01402b1SRalf Baechle /* Now do relocations. */ 891e01402b1SRalf Baechle for (i = 1; i < hdr->e_shnum; i++) { 892e01402b1SRalf Baechle const char *strtab = (char *)sechdrs[strindex].sh_addr; 893e01402b1SRalf Baechle unsigned int info = sechdrs[i].sh_info; 894e01402b1SRalf Baechle 895e01402b1SRalf Baechle /* Not a valid relocation section? */ 896e01402b1SRalf Baechle if (info >= hdr->e_shnum) 897e01402b1SRalf Baechle continue; 898e01402b1SRalf Baechle 899e01402b1SRalf Baechle /* Don't bother with non-allocated sections */ 900e01402b1SRalf Baechle if (!(sechdrs[info].sh_flags & SHF_ALLOC)) 901e01402b1SRalf Baechle continue; 902e01402b1SRalf Baechle 903e01402b1SRalf Baechle if (sechdrs[i].sh_type == SHT_REL) 904e01402b1SRalf Baechle err = 905e01402b1SRalf Baechle apply_relocations(sechdrs, strtab, symindex, i, &mod); 906e01402b1SRalf Baechle else if (sechdrs[i].sh_type == SHT_RELA) 907e01402b1SRalf Baechle err = apply_relocate_add(sechdrs, strtab, symindex, i, 908e01402b1SRalf Baechle &mod); 909e01402b1SRalf Baechle if (err < 0) { 910e01402b1SRalf Baechle printk(KERN_WARNING 911e01402b1SRalf Baechle "vpe_elfload: error in relocations err %ld\n", 912e01402b1SRalf Baechle err); 913e01402b1SRalf Baechle goto cleanup; 914e01402b1SRalf Baechle } 915e01402b1SRalf Baechle } 916e01402b1SRalf Baechle 917e01402b1SRalf Baechle /* make sure it's physically written out */ 918e01402b1SRalf Baechle flush_icache_range((unsigned long)v->load_addr, 919e01402b1SRalf Baechle (unsigned long)v->load_addr + v->len); 920e01402b1SRalf Baechle 921e01402b1SRalf Baechle if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) { 922e01402b1SRalf Baechle 923e01402b1SRalf Baechle printk(KERN_WARNING 924e01402b1SRalf Baechle "VPE: program doesn't contain __start or vpe_shared symbols\n"); 925e01402b1SRalf Baechle err = -ENOEXEC; 926e01402b1SRalf Baechle } 927e01402b1SRalf Baechle 928e01402b1SRalf Baechle printk(" elf loaded\n"); 929e01402b1SRalf Baechle 930e01402b1SRalf Baechle cleanup: 931e01402b1SRalf Baechle return err; 932e01402b1SRalf Baechle } 933e01402b1SRalf Baechle 934e01402b1SRalf Baechle static void dump_vpe(vpe_t * v) 935e01402b1SRalf Baechle { 936e01402b1SRalf Baechle struct tc *t; 937e01402b1SRalf Baechle 938e01402b1SRalf Baechle printk(KERN_DEBUG "VPEControl 0x%lx\n", read_vpe_c0_vpecontrol()); 939e01402b1SRalf Baechle printk(KERN_DEBUG "VPEConf0 0x%lx\n", read_vpe_c0_vpeconf0()); 940e01402b1SRalf Baechle 941e01402b1SRalf Baechle list_for_each_entry(t, &vpecontrol.tc_list, list) { 942e01402b1SRalf Baechle dump_tc(t); 943e01402b1SRalf Baechle } 944e01402b1SRalf Baechle } 945e01402b1SRalf Baechle 946e01402b1SRalf Baechle /* checks for VPE is unused and gets ready to load program */ 947e01402b1SRalf Baechle static int vpe_open(struct inode *inode, struct file *filp) 948e01402b1SRalf Baechle { 949e01402b1SRalf Baechle int minor; 950e01402b1SRalf Baechle vpe_t *v; 951e01402b1SRalf Baechle 952e01402b1SRalf Baechle /* assume only 1 device at the mo. */ 953e01402b1SRalf Baechle if ((minor = MINOR(inode->i_rdev)) != 1) { 954e01402b1SRalf Baechle printk(KERN_WARNING "VPE: only vpe1 is supported\n"); 955e01402b1SRalf Baechle return -ENODEV; 956e01402b1SRalf Baechle } 957e01402b1SRalf Baechle 958e01402b1SRalf Baechle if ((v = get_vpe(minor)) == NULL) { 959e01402b1SRalf Baechle printk(KERN_WARNING "VPE: unable to get vpe\n"); 960e01402b1SRalf Baechle return -ENODEV; 961e01402b1SRalf Baechle } 962e01402b1SRalf Baechle 963e01402b1SRalf Baechle if (v->state != VPE_STATE_UNUSED) { 964e01402b1SRalf Baechle unsigned long tmp; 965e01402b1SRalf Baechle struct tc *t; 966e01402b1SRalf Baechle 967e01402b1SRalf Baechle printk(KERN_WARNING "VPE: device %d already in use\n", minor); 968e01402b1SRalf Baechle 969e01402b1SRalf Baechle dvpe(); 970e01402b1SRalf Baechle dump_vpe(v); 971e01402b1SRalf Baechle 972e01402b1SRalf Baechle printk(KERN_WARNING "VPE: re-initialising %d\n", minor); 973e01402b1SRalf Baechle 974e01402b1SRalf Baechle release_progmem(v->load_addr); 975e01402b1SRalf Baechle 976e01402b1SRalf Baechle t = get_tc(minor); 977e01402b1SRalf Baechle settc(minor); 978e01402b1SRalf Baechle tmp = read_tc_c0_tcstatus(); 979e01402b1SRalf Baechle 980e01402b1SRalf Baechle /* mark not allocated and not dynamically allocatable */ 981e01402b1SRalf Baechle tmp &= ~(TCSTATUS_A | TCSTATUS_DA); 982e01402b1SRalf Baechle tmp |= TCSTATUS_IXMT; /* interrupt exempt */ 983e01402b1SRalf Baechle write_tc_c0_tcstatus(tmp); 984e01402b1SRalf Baechle 985e01402b1SRalf Baechle write_tc_c0_tchalt(TCHALT_H); 986e01402b1SRalf Baechle 987e01402b1SRalf Baechle } 988e01402b1SRalf Baechle 989e01402b1SRalf Baechle // allocate it so when we get write ops we know it's expected. 990e01402b1SRalf Baechle v->state = VPE_STATE_INUSE; 991e01402b1SRalf Baechle 992e01402b1SRalf Baechle /* this of-course trashes what was there before... */ 993e01402b1SRalf Baechle v->pbuffer = vmalloc(P_SIZE); 994e01402b1SRalf Baechle v->plen = P_SIZE; 995e01402b1SRalf Baechle v->load_addr = NULL; 996e01402b1SRalf Baechle v->len = 0; 997e01402b1SRalf Baechle 998e01402b1SRalf Baechle return 0; 999e01402b1SRalf Baechle } 1000e01402b1SRalf Baechle 1001e01402b1SRalf Baechle static int vpe_release(struct inode *inode, struct file *filp) 1002e01402b1SRalf Baechle { 1003e01402b1SRalf Baechle int minor, ret = 0; 1004e01402b1SRalf Baechle vpe_t *v; 1005e01402b1SRalf Baechle Elf_Ehdr *hdr; 1006e01402b1SRalf Baechle 1007e01402b1SRalf Baechle minor = MINOR(inode->i_rdev); 1008e01402b1SRalf Baechle if ((v = get_vpe(minor)) == NULL) 1009e01402b1SRalf Baechle return -ENODEV; 1010e01402b1SRalf Baechle 1011e01402b1SRalf Baechle // simple case of fire and forget, so tell the VPE to run... 1012e01402b1SRalf Baechle 1013e01402b1SRalf Baechle hdr = (Elf_Ehdr *) v->pbuffer; 1014e01402b1SRalf Baechle if (memcmp(hdr->e_ident, ELFMAG, 4) == 0) { 1015e01402b1SRalf Baechle if (vpe_elfload(v) >= 0) 1016e01402b1SRalf Baechle vpe_run(v); 1017e01402b1SRalf Baechle else { 1018e01402b1SRalf Baechle printk(KERN_WARNING "VPE: ELF load failed.\n"); 1019e01402b1SRalf Baechle ret = -ENOEXEC; 1020e01402b1SRalf Baechle } 1021e01402b1SRalf Baechle } else { 1022e01402b1SRalf Baechle printk(KERN_WARNING "VPE: only elf files are supported\n"); 1023e01402b1SRalf Baechle ret = -ENOEXEC; 1024e01402b1SRalf Baechle } 1025e01402b1SRalf Baechle 1026e01402b1SRalf Baechle // cleanup any temp buffers 1027e01402b1SRalf Baechle if (v->pbuffer) 1028e01402b1SRalf Baechle vfree(v->pbuffer); 1029e01402b1SRalf Baechle v->plen = 0; 1030e01402b1SRalf Baechle return ret; 1031e01402b1SRalf Baechle } 1032e01402b1SRalf Baechle 1033e01402b1SRalf Baechle static ssize_t vpe_write(struct file *file, const char __user * buffer, 1034e01402b1SRalf Baechle size_t count, loff_t * ppos) 1035e01402b1SRalf Baechle { 1036e01402b1SRalf Baechle int minor; 1037e01402b1SRalf Baechle size_t ret = count; 1038e01402b1SRalf Baechle vpe_t *v; 1039e01402b1SRalf Baechle 1040e01402b1SRalf Baechle minor = MINOR(file->f_dentry->d_inode->i_rdev); 1041e01402b1SRalf Baechle if ((v = get_vpe(minor)) == NULL) 1042e01402b1SRalf Baechle return -ENODEV; 1043e01402b1SRalf Baechle 1044e01402b1SRalf Baechle if (v->pbuffer == NULL) { 1045e01402b1SRalf Baechle printk(KERN_ERR "vpe_write: no pbuffer\n"); 1046e01402b1SRalf Baechle return -ENOMEM; 1047e01402b1SRalf Baechle } 1048e01402b1SRalf Baechle 1049e01402b1SRalf Baechle if ((count + v->len) > v->plen) { 1050e01402b1SRalf Baechle printk(KERN_WARNING 1051e01402b1SRalf Baechle "VPE Loader: elf size too big. Perhaps strip uneeded symbols\n"); 1052e01402b1SRalf Baechle return -ENOMEM; 1053e01402b1SRalf Baechle } 1054e01402b1SRalf Baechle 1055e01402b1SRalf Baechle count -= copy_from_user(v->pbuffer + v->len, buffer, count); 1056e01402b1SRalf Baechle if (!count) { 1057e01402b1SRalf Baechle printk("vpe_write: copy_to_user failed\n"); 1058e01402b1SRalf Baechle return -EFAULT; 1059e01402b1SRalf Baechle } 1060e01402b1SRalf Baechle 1061e01402b1SRalf Baechle v->len += count; 1062e01402b1SRalf Baechle return ret; 1063e01402b1SRalf Baechle } 1064e01402b1SRalf Baechle 1065e01402b1SRalf Baechle static struct file_operations vpe_fops = { 1066e01402b1SRalf Baechle .owner = THIS_MODULE, 1067e01402b1SRalf Baechle .open = vpe_open, 1068e01402b1SRalf Baechle .release = vpe_release, 1069e01402b1SRalf Baechle .write = vpe_write 1070e01402b1SRalf Baechle }; 1071e01402b1SRalf Baechle 1072e01402b1SRalf Baechle /* module wrapper entry points */ 1073e01402b1SRalf Baechle /* give me a vpe */ 1074e01402b1SRalf Baechle vpe_handle vpe_alloc(void) 1075e01402b1SRalf Baechle { 1076e01402b1SRalf Baechle int i; 1077e01402b1SRalf Baechle struct vpe *v; 1078e01402b1SRalf Baechle 1079e01402b1SRalf Baechle /* find a vpe */ 1080e01402b1SRalf Baechle for (i = 1; i < MAX_VPES; i++) { 1081e01402b1SRalf Baechle if ((v = get_vpe(i)) != NULL) { 1082e01402b1SRalf Baechle v->state = VPE_STATE_INUSE; 1083e01402b1SRalf Baechle return v; 1084e01402b1SRalf Baechle } 1085e01402b1SRalf Baechle } 1086e01402b1SRalf Baechle return NULL; 1087e01402b1SRalf Baechle } 1088e01402b1SRalf Baechle 1089e01402b1SRalf Baechle EXPORT_SYMBOL(vpe_alloc); 1090e01402b1SRalf Baechle 1091e01402b1SRalf Baechle /* start running from here */ 1092e01402b1SRalf Baechle int vpe_start(vpe_handle vpe, unsigned long start) 1093e01402b1SRalf Baechle { 1094e01402b1SRalf Baechle struct vpe *v = vpe; 1095e01402b1SRalf Baechle 1096e01402b1SRalf Baechle v->__start = start; 1097e01402b1SRalf Baechle return vpe_run(v); 1098e01402b1SRalf Baechle } 1099e01402b1SRalf Baechle 1100e01402b1SRalf Baechle EXPORT_SYMBOL(vpe_start); 1101e01402b1SRalf Baechle 1102e01402b1SRalf Baechle /* halt it for now */ 1103e01402b1SRalf Baechle int vpe_stop(vpe_handle vpe) 1104e01402b1SRalf Baechle { 1105e01402b1SRalf Baechle struct vpe *v = vpe; 1106e01402b1SRalf Baechle struct tc *t; 1107e01402b1SRalf Baechle unsigned int evpe_flags; 1108e01402b1SRalf Baechle 1109e01402b1SRalf Baechle evpe_flags = dvpe(); 1110e01402b1SRalf Baechle 1111e01402b1SRalf Baechle if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) { 1112e01402b1SRalf Baechle 1113e01402b1SRalf Baechle settc(t->index); 1114e01402b1SRalf Baechle write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA); 1115e01402b1SRalf Baechle } 1116e01402b1SRalf Baechle 1117e01402b1SRalf Baechle evpe(evpe_flags); 1118e01402b1SRalf Baechle 1119e01402b1SRalf Baechle return 0; 1120e01402b1SRalf Baechle } 1121e01402b1SRalf Baechle 1122e01402b1SRalf Baechle EXPORT_SYMBOL(vpe_stop); 1123e01402b1SRalf Baechle 1124e01402b1SRalf Baechle /* I've done with it thank you */ 1125e01402b1SRalf Baechle int vpe_free(vpe_handle vpe) 1126e01402b1SRalf Baechle { 1127e01402b1SRalf Baechle struct vpe *v = vpe; 1128e01402b1SRalf Baechle struct tc *t; 1129e01402b1SRalf Baechle unsigned int evpe_flags; 1130e01402b1SRalf Baechle 1131e01402b1SRalf Baechle if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) { 1132e01402b1SRalf Baechle return -ENOEXEC; 1133e01402b1SRalf Baechle } 1134e01402b1SRalf Baechle 1135e01402b1SRalf Baechle evpe_flags = dvpe(); 1136e01402b1SRalf Baechle 1137e01402b1SRalf Baechle /* Put MVPE's into 'configuration state' */ 1138340ee4b9SRalf Baechle set_c0_mvpcontrol(MVPCONTROL_VPC); 1139e01402b1SRalf Baechle 1140e01402b1SRalf Baechle settc(t->index); 1141e01402b1SRalf Baechle write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA); 1142e01402b1SRalf Baechle 1143e01402b1SRalf Baechle /* mark the TC unallocated and halt'ed */ 1144e01402b1SRalf Baechle write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A); 1145e01402b1SRalf Baechle write_tc_c0_tchalt(TCHALT_H); 1146e01402b1SRalf Baechle 1147e01402b1SRalf Baechle v->state = VPE_STATE_UNUSED; 1148e01402b1SRalf Baechle 1149340ee4b9SRalf Baechle clear_c0_mvpcontrol(MVPCONTROL_VPC); 1150e01402b1SRalf Baechle evpe(evpe_flags); 1151e01402b1SRalf Baechle 1152e01402b1SRalf Baechle return 0; 1153e01402b1SRalf Baechle } 1154e01402b1SRalf Baechle 1155e01402b1SRalf Baechle EXPORT_SYMBOL(vpe_free); 1156e01402b1SRalf Baechle 1157e01402b1SRalf Baechle void *vpe_get_shared(int index) 1158e01402b1SRalf Baechle { 1159e01402b1SRalf Baechle struct vpe *v; 1160e01402b1SRalf Baechle 1161e01402b1SRalf Baechle if ((v = get_vpe(index)) == NULL) { 1162e01402b1SRalf Baechle printk(KERN_WARNING "vpe: invalid vpe index %d\n", index); 1163e01402b1SRalf Baechle return NULL; 1164e01402b1SRalf Baechle } 1165e01402b1SRalf Baechle 1166e01402b1SRalf Baechle return v->shared_ptr; 1167e01402b1SRalf Baechle } 1168e01402b1SRalf Baechle 1169e01402b1SRalf Baechle EXPORT_SYMBOL(vpe_get_shared); 1170e01402b1SRalf Baechle 1171e01402b1SRalf Baechle static int __init vpe_module_init(void) 1172e01402b1SRalf Baechle { 1173e01402b1SRalf Baechle struct vpe *v = NULL; 1174e01402b1SRalf Baechle struct tc *t; 1175e01402b1SRalf Baechle unsigned long val; 1176e01402b1SRalf Baechle int i; 1177e01402b1SRalf Baechle 1178e01402b1SRalf Baechle if (!cpu_has_mipsmt) { 1179e01402b1SRalf Baechle printk("VPE loader: not a MIPS MT capable processor\n"); 1180e01402b1SRalf Baechle return -ENODEV; 1181e01402b1SRalf Baechle } 1182e01402b1SRalf Baechle 1183e01402b1SRalf Baechle if ((major = register_chrdev(VPE_MAJOR, module_name, &vpe_fops) < 0)) { 1184e01402b1SRalf Baechle printk("VPE loader: unable to register character device\n"); 1185e01402b1SRalf Baechle return -EBUSY; 1186e01402b1SRalf Baechle } 1187e01402b1SRalf Baechle 1188e01402b1SRalf Baechle if (major == 0) 1189e01402b1SRalf Baechle major = VPE_MAJOR; 1190e01402b1SRalf Baechle 1191e01402b1SRalf Baechle dmt(); 1192e01402b1SRalf Baechle dvpe(); 1193e01402b1SRalf Baechle 1194e01402b1SRalf Baechle /* Put MVPE's into 'configuration state' */ 1195340ee4b9SRalf Baechle set_c0_mvpcontrol(MVPCONTROL_VPC); 1196e01402b1SRalf Baechle 1197e01402b1SRalf Baechle /* dump_mtregs(); */ 1198e01402b1SRalf Baechle 1199e01402b1SRalf Baechle INIT_LIST_HEAD(&vpecontrol.vpe_list); 1200e01402b1SRalf Baechle INIT_LIST_HEAD(&vpecontrol.tc_list); 1201e01402b1SRalf Baechle 1202e01402b1SRalf Baechle val = read_c0_mvpconf0(); 1203e01402b1SRalf Baechle for (i = 0; i < ((val & MVPCONF0_PTC) + 1); i++) { 1204e01402b1SRalf Baechle t = alloc_tc(i); 1205e01402b1SRalf Baechle 1206e01402b1SRalf Baechle /* VPE's */ 1207e01402b1SRalf Baechle if (i < ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1) { 1208e01402b1SRalf Baechle settc(i); 1209e01402b1SRalf Baechle 1210e01402b1SRalf Baechle if ((v = alloc_vpe(i)) == NULL) { 1211e01402b1SRalf Baechle printk(KERN_WARNING "VPE: unable to allocate VPE\n"); 1212e01402b1SRalf Baechle return -ENODEV; 1213e01402b1SRalf Baechle } 1214e01402b1SRalf Baechle 1215e01402b1SRalf Baechle list_add(&t->tc, &v->tc); /* add the tc to the list of this vpe's tc's. */ 1216e01402b1SRalf Baechle 1217e01402b1SRalf Baechle /* deactivate all but vpe0 */ 1218e01402b1SRalf Baechle if (i != 0) { 1219e01402b1SRalf Baechle unsigned long tmp = read_vpe_c0_vpeconf0(); 1220e01402b1SRalf Baechle 1221e01402b1SRalf Baechle tmp &= ~VPECONF0_VPA; 1222e01402b1SRalf Baechle 1223e01402b1SRalf Baechle /* master VPE */ 1224e01402b1SRalf Baechle tmp |= VPECONF0_MVP; 1225e01402b1SRalf Baechle write_vpe_c0_vpeconf0(tmp); 1226e01402b1SRalf Baechle } 1227e01402b1SRalf Baechle 1228e01402b1SRalf Baechle /* disable multi-threading with TC's */ 1229e01402b1SRalf Baechle write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); 1230e01402b1SRalf Baechle 1231e01402b1SRalf Baechle if (i != 0) { 1232e01402b1SRalf Baechle write_vpe_c0_status((read_c0_status() & 1233e01402b1SRalf Baechle ~(ST0_IM | ST0_IE | ST0_KSU)) 1234e01402b1SRalf Baechle | ST0_CU0); 1235e01402b1SRalf Baechle 1236e01402b1SRalf Baechle /* set config to be the same as vpe0, particularly kseg0 coherency alg */ 1237e01402b1SRalf Baechle write_vpe_c0_config(read_c0_config()); 1238e01402b1SRalf Baechle } 1239e01402b1SRalf Baechle 1240e01402b1SRalf Baechle } 1241e01402b1SRalf Baechle 1242e01402b1SRalf Baechle /* TC's */ 1243e01402b1SRalf Baechle t->pvpe = v; /* set the parent vpe */ 1244e01402b1SRalf Baechle 1245e01402b1SRalf Baechle if (i != 0) { 1246e01402b1SRalf Baechle unsigned long tmp; 1247e01402b1SRalf Baechle 1248e01402b1SRalf Baechle /* tc 0 will of course be running.... */ 1249e01402b1SRalf Baechle if (i == 0) 1250e01402b1SRalf Baechle t->state = TC_STATE_RUNNING; 1251e01402b1SRalf Baechle 1252e01402b1SRalf Baechle settc(i); 1253e01402b1SRalf Baechle 1254e01402b1SRalf Baechle /* bind a TC to each VPE, May as well put all excess TC's 1255e01402b1SRalf Baechle on the last VPE */ 1256e01402b1SRalf Baechle if (i >= (((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1)) 1257e01402b1SRalf Baechle write_tc_c0_tcbind(read_tc_c0_tcbind() | 1258e01402b1SRalf Baechle ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)); 1259e01402b1SRalf Baechle else 1260e01402b1SRalf Baechle write_tc_c0_tcbind(read_tc_c0_tcbind() | i); 1261e01402b1SRalf Baechle 1262e01402b1SRalf Baechle tmp = read_tc_c0_tcstatus(); 1263e01402b1SRalf Baechle 1264e01402b1SRalf Baechle /* mark not allocated and not dynamically allocatable */ 1265e01402b1SRalf Baechle tmp &= ~(TCSTATUS_A | TCSTATUS_DA); 1266e01402b1SRalf Baechle tmp |= TCSTATUS_IXMT; /* interrupt exempt */ 1267e01402b1SRalf Baechle write_tc_c0_tcstatus(tmp); 1268e01402b1SRalf Baechle 1269e01402b1SRalf Baechle write_tc_c0_tchalt(TCHALT_H); 1270e01402b1SRalf Baechle } 1271e01402b1SRalf Baechle } 1272e01402b1SRalf Baechle 1273e01402b1SRalf Baechle /* release config state */ 1274340ee4b9SRalf Baechle clear_c0_mvpcontrol(MVPCONTROL_VPC); 1275e01402b1SRalf Baechle 1276e01402b1SRalf Baechle return 0; 1277e01402b1SRalf Baechle } 1278e01402b1SRalf Baechle 1279e01402b1SRalf Baechle static void __exit vpe_module_exit(void) 1280e01402b1SRalf Baechle { 1281e01402b1SRalf Baechle struct vpe *v, *n; 1282e01402b1SRalf Baechle 1283e01402b1SRalf Baechle list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) { 1284e01402b1SRalf Baechle if (v->state != VPE_STATE_UNUSED) { 1285e01402b1SRalf Baechle release_vpe(v); 1286e01402b1SRalf Baechle } 1287e01402b1SRalf Baechle } 1288e01402b1SRalf Baechle 1289e01402b1SRalf Baechle unregister_chrdev(major, module_name); 1290e01402b1SRalf Baechle } 1291e01402b1SRalf Baechle 1292e01402b1SRalf Baechle module_init(vpe_module_init); 1293e01402b1SRalf Baechle module_exit(vpe_module_exit); 1294e01402b1SRalf Baechle MODULE_DESCRIPTION("MIPS VPE Loader"); 1295e01402b1SRalf Baechle MODULE_AUTHOR("Elizabeth Clarke, MIPS Technologies, Inc"); 1296e01402b1SRalf Baechle MODULE_LICENSE("GPL"); 1297