1#include <linux/linkage.h> 2#include <linux/threads.h> 3#include <asm/asm-offsets.h> 4#include <asm/assembler.h> 5#include <asm/glue-cache.h> 6#include <asm/glue-proc.h> 7 .text 8 9/* 10 * Implementation of MPIDR hash algorithm through shifting 11 * and OR'ing. 12 * 13 * @dst: register containing hash result 14 * @rs0: register containing affinity level 0 bit shift 15 * @rs1: register containing affinity level 1 bit shift 16 * @rs2: register containing affinity level 2 bit shift 17 * @mpidr: register containing MPIDR value 18 * @mask: register containing MPIDR mask 19 * 20 * Pseudo C-code: 21 * 22 *u32 dst; 23 * 24 *compute_mpidr_hash(u32 rs0, u32 rs1, u32 rs2, u32 mpidr, u32 mask) { 25 * u32 aff0, aff1, aff2; 26 * u32 mpidr_masked = mpidr & mask; 27 * aff0 = mpidr_masked & 0xff; 28 * aff1 = mpidr_masked & 0xff00; 29 * aff2 = mpidr_masked & 0xff0000; 30 * dst = (aff0 >> rs0 | aff1 >> rs1 | aff2 >> rs2); 31 *} 32 * Input registers: rs0, rs1, rs2, mpidr, mask 33 * Output register: dst 34 * Note: input and output registers must be disjoint register sets 35 (eg: a macro instance with mpidr = r1 and dst = r1 is invalid) 36 */ 37 .macro compute_mpidr_hash dst, rs0, rs1, rs2, mpidr, mask 38 and \mpidr, \mpidr, \mask @ mask out MPIDR bits 39 and \dst, \mpidr, #0xff @ mask=aff0 40 ARM( mov \dst, \dst, lsr \rs0 ) @ dst=aff0>>rs0 41 THUMB( lsr \dst, \dst, \rs0 ) 42 and \mask, \mpidr, #0xff00 @ mask = aff1 43 ARM( orr \dst, \dst, \mask, lsr \rs1 ) @ dst|=(aff1>>rs1) 44 THUMB( lsr \mask, \mask, \rs1 ) 45 THUMB( orr \dst, \dst, \mask ) 46 and \mask, \mpidr, #0xff0000 @ mask = aff2 47 ARM( orr \dst, \dst, \mask, lsr \rs2 ) @ dst|=(aff2>>rs2) 48 THUMB( lsr \mask, \mask, \rs2 ) 49 THUMB( orr \dst, \dst, \mask ) 50 .endm 51 52/* 53 * Save CPU state for a suspend. This saves the CPU general purpose 54 * registers, and allocates space on the kernel stack to save the CPU 55 * specific registers and some other data for resume. 56 * r0 = suspend function arg0 57 * r1 = suspend function 58 */ 59ENTRY(__cpu_suspend) 60 stmfd sp!, {r4 - r11, lr} 61#ifdef MULTI_CPU 62 ldr r10, =processor 63 ldr r4, [r10, #CPU_SLEEP_SIZE] @ size of CPU sleep state 64#else 65 ldr r4, =cpu_suspend_size 66#endif 67 mov r5, sp @ current virtual SP 68 add r4, r4, #12 @ Space for pgd, virt sp, phys resume fn 69 sub sp, sp, r4 @ allocate CPU state on stack 70 stmfd sp!, {r0, r1} @ save suspend func arg and pointer 71 add r0, sp, #8 @ save pointer to save block 72 mov r1, r4 @ size of save block 73 mov r2, r5 @ virtual SP 74 ldr r3, =sleep_save_sp 75 ldr r3, [r3, #SLEEP_SAVE_SP_VIRT] 76 ALT_SMP(mrc p15, 0, r9, c0, c0, 5) 77 ALT_UP_B(1f) 78 ldr r8, =mpidr_hash 79 /* 80 * This ldmia relies on the memory layout of the mpidr_hash 81 * struct mpidr_hash. 82 */ 83 ldmia r8, {r4-r7} @ r4 = mpidr mask (r5,r6,r7) = l[0,1,2] shifts 84 compute_mpidr_hash lr, r5, r6, r7, r9, r4 85 add r3, r3, lr, lsl #2 861: 87 bl __cpu_suspend_save 88 adr lr, BSYM(cpu_suspend_abort) 89 ldmfd sp!, {r0, pc} @ call suspend fn 90ENDPROC(__cpu_suspend) 91 .ltorg 92 93cpu_suspend_abort: 94 ldmia sp!, {r1 - r3} @ pop phys pgd, virt SP, phys resume fn 95 teq r0, #0 96 moveq r0, #1 @ force non-zero value 97 mov sp, r2 98 ldmfd sp!, {r4 - r11, pc} 99ENDPROC(cpu_suspend_abort) 100 101/* 102 * r0 = control register value 103 */ 104 .align 5 105 .pushsection .idmap.text,"ax" 106ENTRY(cpu_resume_mmu) 107 ldr r3, =cpu_resume_after_mmu 108 instr_sync 109 mcr p15, 0, r0, c1, c0, 0 @ turn on MMU, I-cache, etc 110 mrc p15, 0, r0, c0, c0, 0 @ read id reg 111 instr_sync 112 mov r0, r0 113 mov r0, r0 114 mov pc, r3 @ jump to virtual address 115ENDPROC(cpu_resume_mmu) 116 .popsection 117cpu_resume_after_mmu: 118 bl cpu_init @ restore the und/abt/irq banked regs 119 mov r0, #0 @ return zero on success 120 ldmfd sp!, {r4 - r11, pc} 121ENDPROC(cpu_resume_after_mmu) 122 123/* 124 * Note: Yes, part of the following code is located into the .data section. 125 * This is to allow sleep_save_sp to be accessed with a relative load 126 * while we can't rely on any MMU translation. We could have put 127 * sleep_save_sp in the .text section as well, but some setups might 128 * insist on it to be truly read-only. 129 */ 130 .data 131 .align 132ENTRY(cpu_resume) 133 mov r1, #0 134 ALT_SMP(mrc p15, 0, r0, c0, c0, 5) 135 ALT_UP_B(1f) 136 adr r2, mpidr_hash_ptr 137 ldr r3, [r2] 138 add r2, r2, r3 @ r2 = struct mpidr_hash phys address 139 /* 140 * This ldmia relies on the memory layout of the mpidr_hash 141 * struct mpidr_hash. 142 */ 143 ldmia r2, { r3-r6 } @ r3 = mpidr mask (r4,r5,r6) = l[0,1,2] shifts 144 compute_mpidr_hash r1, r4, r5, r6, r0, r3 1451: 146 adr r0, _sleep_save_sp 147 ldr r0, [r0, #SLEEP_SAVE_SP_PHYS] 148 ldr r0, [r0, r1, lsl #2] 149 150 setmode PSR_I_BIT | PSR_F_BIT | SVC_MODE, r1 @ set SVC, irqs off 151 @ load phys pgd, stack, resume fn 152 ARM( ldmia r0!, {r1, sp, pc} ) 153THUMB( ldmia r0!, {r1, r2, r3} ) 154THUMB( mov sp, r2 ) 155THUMB( bx r3 ) 156ENDPROC(cpu_resume) 157 158 .align 2 159mpidr_hash_ptr: 160 .long mpidr_hash - . @ mpidr_hash struct offset 161 162 .type sleep_save_sp, #object 163ENTRY(sleep_save_sp) 164_sleep_save_sp: 165 .space SLEEP_SAVE_SP_SZ @ struct sleep_save_sp 166