diff options
Diffstat (limited to 'arch/xtensa/include/asm/initialize_mmu.h')
| -rw-r--r-- | arch/xtensa/include/asm/initialize_mmu.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/initialize_mmu.h b/arch/xtensa/include/asm/initialize_mmu.h index e1f8ba4061ed..722553f17db3 100644 --- a/arch/xtensa/include/asm/initialize_mmu.h +++ b/arch/xtensa/include/asm/initialize_mmu.h @@ -23,6 +23,9 @@ #ifndef _XTENSA_INITIALIZE_MMU_H #define _XTENSA_INITIALIZE_MMU_H +#include <asm/pgtable.h> +#include <asm/vectors.h> + #ifdef __ASSEMBLY__ #define XTENSA_HWVERSION_RC_2009_0 230000 @@ -48,6 +51,110 @@ * (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0) */ +#if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY +/* + * Have MMU v3 + */ + +#if !XCHAL_HAVE_VECBASE +# error "MMU v3 requires reloc vectors" +#endif + + movi a1, 0 + _call0 1f + _j 2f + + .align 4 +1: movi a2, 0x10000000 + movi a3, 0x18000000 + add a2, a2, a0 +9: bgeu a2, a3, 9b /* PC is out of the expected range */ + + /* Step 1: invalidate mapping at 0x40000000..0x5FFFFFFF. */ + + movi a2, 0x40000006 + idtlb a2 + iitlb a2 + isync + + /* Step 2: map 0x40000000..0x47FFFFFF to paddr containing this code + * and jump to the new mapping. + */ +#define CA_BYPASS (_PAGE_CA_BYPASS | _PAGE_HW_WRITE | _PAGE_HW_EXEC) +#define CA_WRITEBACK (_PAGE_CA_WB | _PAGE_HW_WRITE | _PAGE_HW_EXEC) + + srli a3, a0, 27 + slli a3, a3, 27 + addi a3, a3, CA_BYPASS + addi a7, a2, -1 + wdtlb a3, a7 + witlb a3, a7 + isync + + slli a4, a0, 5 + srli a4, a4, 5 + addi a5, a2, -6 + add a4, a4, a5 + jx a4 + + /* Step 3: unmap everything other than current area. + * Start at 0x60000000, wrap around, and end with 0x20000000 + */ +2: movi a4, 0x20000000 + add a5, a2, a4 +3: idtlb a5 + iitlb a5 + add a5, a5, a4 + bne a5, a2, 3b + + /* Step 4: Setup MMU with the old V2 mappings. */ + movi a6, 0x01000000 + wsr a6, ITLBCFG + wsr a6, DTLBCFG + isync + + movi a5, 0xd0000005 + movi a4, CA_WRITEBACK + wdtlb a4, a5 + witlb a4, a5 + + movi a5, 0xd8000005 + movi a4, CA_BYPASS + wdtlb a4, a5 + witlb a4, a5 + + movi a5, 0xe0000006 + movi a4, 0xf0000000 + CA_WRITEBACK + wdtlb a4, a5 + witlb a4, a5 + + movi a5, 0xf0000006 + movi a4, 0xf0000000 + CA_BYPASS + wdtlb a4, a5 + witlb a4, a5 + + isync + + /* Jump to self, using MMU v2 mappings. */ + movi a4, 1f + jx a4 + +1: + movi a2, VECBASE_RESET_VADDR + wsr a2, vecbase + + /* Step 5: remove temporary mapping. */ + idtlb a7 + iitlb a7 + isync + + movi a0, 0 + wsr a0, ptevaddr + rsync + +#endif /* defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && + XCHAL_HAVE_SPANNING_WAY */ + .endm #endif /*__ASSEMBLY__*/ |