1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * File created by Kanoj Sarcar 06/06/00. 4 * Copyright 2000 Silicon Graphics, Inc. 5 */ 6 #ifndef __ASM_SN_MAPPED_KERNEL_H 7 #define __ASM_SN_MAPPED_KERNEL_H 8 9 #include <linux/mmzone.h> 10 11 /* 12 * Note on how mapped kernels work: the text and data section is 13 * compiled at cksseg segment (LOADADDR = 0xc001c000), and the 14 * init/setup/data section gets a 16M virtual address bump in the 15 * ld.script file (so that tlblo0 and tlblo1 maps the sections). 16 * The vmlinux.64 section addresses are put in the xkseg range 17 * using the change-addresses makefile option. Use elfdump -of 18 * on IRIX to see where the sections go. The Origin loader loads 19 * the two sections contiguously in physical memory. The loader 20 * sets the entry point into kernel_entry using a xkphys address, 21 * but instead of using 0xa800000001160000, it uses the address 22 * 0xa800000000160000, which is where it physically loaded that 23 * code. So no jumps can be done before we have switched to using 24 * cksseg addresses. 25 */ 26 #include <asm/addrspace.h> 27 28 #define REP_BASE CAC_BASE 29 30 #ifdef CONFIG_MAPPED_KERNEL 31 32 #define MAPPED_ADDR_RO_TO_PHYS(x) (x - REP_BASE) 33 #define MAPPED_ADDR_RW_TO_PHYS(x) (x - REP_BASE - 16777216) 34 35 #define MAPPED_KERN_RO_PHYSBASE(n) (hub_data(n)->kern_vars.kv_ro_baseaddr) 36 #define MAPPED_KERN_RW_PHYSBASE(n) (hub_data(n)->kern_vars.kv_rw_baseaddr) 37 38 #define MAPPED_KERN_RO_TO_PHYS(x) \ 39 ((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \ 40 MAPPED_KERN_RO_PHYSBASE(get_compact_nodeid())) 41 #define MAPPED_KERN_RW_TO_PHYS(x) \ 42 ((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \ 43 MAPPED_KERN_RW_PHYSBASE(get_compact_nodeid())) 44 45 #else /* CONFIG_MAPPED_KERNEL */ 46 47 #define MAPPED_KERN_RO_TO_PHYS(x) (x - REP_BASE) 48 #define MAPPED_KERN_RW_TO_PHYS(x) (x - REP_BASE) 49 50 #endif /* CONFIG_MAPPED_KERNEL */ 51 52 #define MAPPED_KERN_RO_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RO_TO_PHYS(x)) 53 #define MAPPED_KERN_RW_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RW_TO_PHYS(x)) 54 55 #endif /* __ASM_SN_MAPPED_KERNEL_H */ 56