diff options
Diffstat (limited to 'arch/powerpc/mm/tlb_nohash.c')
| -rw-r--r-- | arch/powerpc/mm/tlb_nohash.c | 129 |
1 files changed, 103 insertions, 26 deletions
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c index d8695b02a96..fe391e94252 100644 --- a/arch/powerpc/mm/tlb_nohash.c +++ b/arch/powerpc/mm/tlb_nohash.c @@ -46,6 +46,7 @@ struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = { [MMU_PAGE_4K] = { .shift = 12, + .ind = 20, .enc = BOOK3E_PAGESZ_4K, }, [MMU_PAGE_16K] = { @@ -54,6 +55,7 @@ struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = { }, [MMU_PAGE_64K] = { .shift = 16, + .ind = 28, .enc = BOOK3E_PAGESZ_64K, }, [MMU_PAGE_1M] = { @@ -62,6 +64,7 @@ struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = { }, [MMU_PAGE_16M] = { .shift = 24, + .ind = 36, .enc = BOOK3E_PAGESZ_16M, }, [MMU_PAGE_256M] = { @@ -344,16 +347,108 @@ void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address) } } -/* - * Early initialization of the MMU TLB code - */ -static void __early_init_mmu(int boot_cpu) +static void setup_page_sizes(void) +{ + unsigned int tlb0cfg = mfspr(SPRN_TLB0CFG); + unsigned int tlb0ps = mfspr(SPRN_TLB0PS); + unsigned int eptcfg = mfspr(SPRN_EPTCFG); + int i, psize; + + /* Look for supported direct sizes */ + for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { + struct mmu_psize_def *def = &mmu_psize_defs[psize]; + + if (tlb0ps & (1U << (def->shift - 10))) + def->flags |= MMU_PAGE_SIZE_DIRECT; + } + + /* Indirect page sizes supported ? */ + if ((tlb0cfg & TLBnCFG_IND) == 0) + goto no_indirect; + + /* Now, we only deal with one IND page size for each + * direct size. Hopefully all implementations today are + * unambiguous, but we might want to be careful in the + * future. + */ + for (i = 0; i < 3; i++) { + unsigned int ps, sps; + + sps = eptcfg & 0x1f; + eptcfg >>= 5; + ps = eptcfg & 0x1f; + eptcfg >>= 5; + if (!ps || !sps) + continue; + for (psize = 0; psize < MMU_PAGE_COUNT; psize++) { + struct mmu_psize_def *def = &mmu_psize_defs[psize]; + + if (ps == (def->shift - 10)) + def->flags |= MMU_PAGE_SIZE_INDIRECT; + if (sps == (def->shift - 10)) + def->ind = ps + 10; + } + } + no_indirect: + + /* Cleanup array and print summary */ + pr_info("MMU: Supported page sizes\n"); + for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { + struct mmu_psize_def *def = &mmu_psize_defs[psize]; + const char *__page_type_names[] = { + "unsupported", + "direct", + "indirect", + "direct & indirect" + }; + if (def->flags == 0) { + def->shift = 0; + continue; + } + pr_info(" %8ld KB as %s\n", 1ul << (def->shift - 10), + __page_type_names[def->flags & 0x3]); + } +} + +static void setup_mmu_htw(void) { extern unsigned int interrupt_base_book3e; extern unsigned int exc_data_tlb_miss_htw_book3e; extern unsigned int exc_instruction_tlb_miss_htw_book3e; unsigned int *ibase = &interrupt_base_book3e; + + /* Check if HW tablewalk is present, and if yes, enable it by: + * + * - patching the TLB miss handlers to branch to the + * one dedicates to it + * + * - setting the global book3e_htw_enabled + */ + unsigned int tlb0cfg = mfspr(SPRN_TLB0CFG); + + if ((tlb0cfg & TLBnCFG_IND) && + (tlb0cfg & TLBnCFG_PT)) { + /* Our exceptions vectors start with a NOP and -then- a branch + * to deal with single stepping from userspace which stops on + * the second instruction. Thus we need to patch the second + * instruction of the exception, not the first one + */ + patch_branch(ibase + (0x1c0 / 4) + 1, + (unsigned long)&exc_data_tlb_miss_htw_book3e, 0); + patch_branch(ibase + (0x1e0 / 4) + 1, + (unsigned long)&exc_instruction_tlb_miss_htw_book3e, 0); + book3e_htw_enabled = 1; + } + pr_info("MMU: Book3E Page Tables %s\n", + book3e_htw_enabled ? "Enabled" : "Disabled"); +} + +/* + * Early initialization of the MMU TLB code + */ +static void __early_init_mmu(int boot_cpu) +{ unsigned int mas4; /* XXX This will have to be decided at runtime, but right @@ -370,35 +465,17 @@ static void __early_init_mmu(int boot_cpu) */ mmu_vmemmap_psize = MMU_PAGE_16M; - /* Check if HW tablewalk is present, and if yes, enable it by: - * - * - patching the TLB miss handlers to branch to the - * one dedicates to it - * - * - setting the global book3e_htw_enabled - * - * - Set MAS4:INDD and default page size - */ - /* XXX This code only checks for TLB 0 capabilities and doesn't * check what page size combos are supported by the HW. It * also doesn't handle the case where a separate array holds * the IND entries from the array loaded by the PT. */ if (boot_cpu) { - unsigned int tlb0cfg = mfspr(SPRN_TLB0CFG); + /* Look for supported page sizes */ + setup_page_sizes(); - /* Check if HW loader is supported */ - if ((tlb0cfg & TLBnCFG_IND) && - (tlb0cfg & TLBnCFG_PT)) { - patch_branch(ibase + (0x1c0 / 4), - (unsigned long)&exc_data_tlb_miss_htw_book3e, 0); - patch_branch(ibase + (0x1e0 / 4), - (unsigned long)&exc_instruction_tlb_miss_htw_book3e, 0); - book3e_htw_enabled = 1; - } - pr_info("MMU: Book3E Page Tables %s\n", - book3e_htw_enabled ? "Enabled" : "Disabled"); + /* Look for HW tablewalk support */ + setup_mmu_htw(); } /* Set MAS4 based on page table setting */ |