1 /* 2 * File created by Kanoj Sarcar 06/06/00. 3 * Copyright 2000 Silicon Graphics, Inc. 4 */ 5 #ifndef __ASM_SN_MAPPED_KERNEL_H 6 #define __ASM_SN_MAPPED_KERNEL_H 7 8 /* 9 * Note on how mapped kernels work: the text and data section is 10 * compiled at cksseg segment (LOADADDR = 0xc001c000), and the 11 * init/setup/data section gets a 16M virtual address bump in the 12 * ld.script file (so that tlblo0 and tlblo1 maps the sections). 13 * The vmlinux.64 section addresses are put in the xkseg range 14 * using the change-addresses makefile option. Use elfdump -of 15 * on IRIX to see where the sections go. The Origin loader loads 16 * the two sections contiguously in physical memory. The loader 17 * sets the entry point into kernel_entry using a xkphys address, 18 * but instead of using 0xa800000001160000, it uses the address 19 * 0xa800000000160000, which is where it physically loaded that 20 * code. So no jumps can be done before we have switched to using 21 * cksseg addresses. 22 */ 23 #include <linux/config.h> 24 #include <asm/addrspace.h> 25 26 #ifdef CONFIG_MAPPED_KERNEL 27 28 #define MAPPED_ADDR_RO_TO_PHYS(x) (x - CKSSEG) 29 #define MAPPED_ADDR_RW_TO_PHYS(x) (x - CKSSEG - 16777216) 30 31 #define MAPPED_KERN_RO_PHYSBASE(n) \ 32 (PLAT_NODE_DATA(n)->kern_vars.kv_ro_baseaddr) 33 #define MAPPED_KERN_RW_PHYSBASE(n) \ 34 (PLAT_NODE_DATA(n)->kern_vars.kv_rw_baseaddr) 35 36 #define MAPPED_KERN_RO_TO_PHYS(x) \ 37 ((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \ 38 MAPPED_KERN_RO_PHYSBASE(get_compact_nodeid())) 39 #define MAPPED_KERN_RW_TO_PHYS(x) \ 40 ((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \ 41 MAPPED_KERN_RW_PHYSBASE(get_compact_nodeid())) 42 #define MAPPED_OFFSET 16777216 43 44 #else /* CONFIG_MAPPED_KERNEL */ 45 46 #define MAPPED_KERN_RO_TO_PHYS(x) (x - CKSEG0) 47 #define MAPPED_KERN_RW_TO_PHYS(x) (x - CKSEG0) 48 #define MAPPED_OFFSET 0 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