diff options
Diffstat (limited to 'arch/powerpc/kernel/head_32.S')
| -rw-r--r-- | arch/powerpc/kernel/head_32.S | 41 |
1 files changed, 29 insertions, 12 deletions
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index 8bb65751929..a1c4cfd25de 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -31,6 +31,7 @@ #include <asm/ppc_asm.h> #include <asm/asm-offsets.h> #include <asm/ptrace.h> +#include <asm/bug.h> /* 601 only have IBAT; cr0.eq is set on 601 when using this macro */ #define LOAD_BAT(n, reg, RA, RB) \ @@ -110,6 +111,12 @@ __start: #ifdef CONFIG_PPC_MULTIPLATFORM cmpwi 0,r5,0 beq 1f + + /* find out where we are now */ + bcl 20,31,$+4 +0: mflr r8 /* r8 = runtime addr here */ + addis r8,r8,(_stext - 0b)@ha + addi r8,r8,(_stext - 0b)@l /* current runtime base addr */ bl prom_init trap #endif @@ -176,7 +183,8 @@ __after_mmu_off: bl reloc_offset mr r26,r3 addis r4,r3,KERNELBASE@h /* current address of _start */ - cmpwi 0,r4,0 /* are we already running at 0? */ + lis r5,PHYSICAL_START@h + cmplw 0,r4,r5 /* already running at PHYSICAL_START? */ bne relocate_kernel /* * we now have the 1st 16M of ram mapped with the bats. @@ -369,13 +377,13 @@ i##n: \ DataAccess: EXCEPTION_PROLOG mfspr r10,SPRN_DSISR + stw r10,_DSISR(r11) andis. r0,r10,0xa470 /* weird error? */ bne 1f /* if not, try to put a PTE */ mfspr r4,SPRN_DAR /* into the hash table */ rlwinm r3,r10,32-15,21,21 /* DSISR_STORE -> _PAGE_RW */ bl hash_page -1: stw r10,_DSISR(r11) - mr r5,r10 +1: lwz r5,_DSISR(r11) /* get DSISR value */ mfspr r4,SPRN_DAR EXC_XFER_EE_LITE(0x300, handle_page_fault) @@ -804,13 +812,13 @@ giveup_altivec: /* * This code is jumped to from the startup code to copy - * the kernel image to physical address 0. + * the kernel image to physical address PHYSICAL_START. */ relocate_kernel: addis r9,r26,klimit@ha /* fetch klimit */ lwz r25,klimit@l(r9) addis r25,r25,-KERNELBASE@h - li r3,0 /* Destination base address */ + lis r3,PHYSICAL_START@h /* Destination base address */ li r6,0 /* Destination offset */ li r5,0x4000 /* # bytes of memory to copy */ bl copy_and_flush /* copy the first 0x4000 bytes */ @@ -983,12 +991,12 @@ load_up_mmu: LOAD_BAT(1,r3,r4,r5) LOAD_BAT(2,r3,r4,r5) LOAD_BAT(3,r3,r4,r5) -BEGIN_FTR_SECTION +BEGIN_MMU_FTR_SECTION LOAD_BAT(4,r3,r4,r5) LOAD_BAT(5,r3,r4,r5) LOAD_BAT(6,r3,r4,r5) LOAD_BAT(7,r3,r4,r5) -END_FTR_SECTION_IFSET(CPU_FTR_HAS_HIGH_BATS) +END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) blr /* @@ -1064,9 +1072,14 @@ start_here: RFI /* + * void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next); + * * Set up the segment registers for a new context. */ -_ENTRY(set_context) +_ENTRY(switch_mmu_context) + lwz r3,MMCONTEXTID(r4) + cmpwi cr0,r3,0 + blt- 4f mulli r3,r3,897 /* multiply context by skew factor */ rlwinm r3,r3,4,8,27 /* VSID = (context & 0xfffff) << 4 */ addis r3,r3,0x6000 /* Set Ks, Ku bits */ @@ -1077,6 +1090,7 @@ _ENTRY(set_context) /* Context switch the PTE pointer for the Abatron BDI2000. * The PGDIR is passed as second argument. */ + lwz r4,MM_PGD(r4) lis r5, KERNELBASE@h lwz r5, 0xf0(r5) stw r4, 0x4(r5) @@ -1092,6 +1106,9 @@ _ENTRY(set_context) sync isync blr +4: trap + EMIT_BUG_ENTRY 4b,__FILE__,__LINE__,0 + blr /* * An undocumented "feature" of 604e requires that the v bit @@ -1125,7 +1142,7 @@ clear_bats: mtspr SPRN_IBAT2L,r10 mtspr SPRN_IBAT3U,r10 mtspr SPRN_IBAT3L,r10 -BEGIN_FTR_SECTION +BEGIN_MMU_FTR_SECTION /* Here's a tweak: at this point, CPU setup have * not been called yet, so HIGH_BAT_EN may not be * set in HID0 for the 745x processors. However, it @@ -1148,7 +1165,7 @@ BEGIN_FTR_SECTION mtspr SPRN_IBAT6L,r10 mtspr SPRN_IBAT7U,r10 mtspr SPRN_IBAT7L,r10 -END_FTR_SECTION_IFSET(CPU_FTR_HAS_HIGH_BATS) +END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) blr flush_tlbs: @@ -1172,11 +1189,11 @@ mmu_off: /* * Use the first pair of BAT registers to map the 1st 16MB - * of RAM to KERNELBASE. From this point on we can't safely + * of RAM to PAGE_OFFSET. From this point on we can't safely * call OF any more. */ initial_bats: - lis r11,KERNELBASE@h + lis r11,PAGE_OFFSET@h mfspr r9,SPRN_PVR rlwinm r9,r9,16,16,31 /* r9 = 1 for 601, 4 for 604 */ cmpwi 0,r9,1 |