diff options
Diffstat (limited to 'arch/powerpc/mm/fsl_booke_mmu.c')
| -rw-r--r-- | arch/powerpc/mm/fsl_booke_mmu.c | 238 |
1 files changed, 166 insertions, 72 deletions
diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c index bb3d65998e6..94cd728166d 100644 --- a/arch/powerpc/mm/fsl_booke_mmu.c +++ b/arch/powerpc/mm/fsl_booke_mmu.c @@ -2,7 +2,7 @@ * Modifications by Kumar Gala (galak@kernel.crashing.org) to support * E500 Book E processors. * - * Copyright 2004 Freescale Semiconductor, Inc + * Copyright 2004,2010 Freescale Semiconductor, Inc. * * This file contains the routines for initializing the MMU * on the 4xx series of chips. @@ -40,6 +40,7 @@ #include <linux/init.h> #include <linux/delay.h> #include <linux/highmem.h> +#include <linux/memblock.h> #include <asm/pgalloc.h> #include <asm/prom.h> @@ -51,29 +52,28 @@ #include <asm/smp.h> #include <asm/machdep.h> #include <asm/setup.h> +#include <asm/paca.h> #include "mmu_decl.h" -extern void loadcam_entry(unsigned int index); unsigned int tlbcam_index; -static unsigned long cam[CONFIG_LOWMEM_CAM_NUM]; - -#define NUM_TLBCAMS (16) - -#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS) -#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS" -#endif +#define NUM_TLBCAMS (64) struct tlbcam TLBCAM[NUM_TLBCAMS]; struct tlbcamrange { - unsigned long start; + unsigned long start; unsigned long limit; phys_addr_t phys; } tlbcam_addrs[NUM_TLBCAMS]; extern unsigned int tlbcam_index; +unsigned long tlbcam_sz(int idx) +{ + return tlbcam_addrs[idx].limit - tlbcam_addrs[idx].start + 1; +} + /* * Return PA for this VA if it is mapped by a CAM, or 0 */ @@ -94,24 +94,25 @@ unsigned long p_mapped_by_tlbcam(phys_addr_t pa) int b; for (b = 0; b < tlbcam_index; ++b) if (pa >= tlbcam_addrs[b].phys - && pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start) + && pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start) +tlbcam_addrs[b].phys) return tlbcam_addrs[b].start+(pa-tlbcam_addrs[b].phys); return 0; } /* - * Set up one of the I/D BAT (block address translation) register pairs. - * The parameters are not checked; in particular size must be a power - * of 4 between 4k and 256M. + * Set up a variable-size TLB entry (tlbcam). The parameters are not checked; + * in particular size must be a power of 4 between 4k and the max supported by + * an implementation; max may further be limited by what can be represented in + * an unsigned long (for example, 32-bit implementations cannot support a 4GB + * size). */ -void settlbcam(int index, unsigned long virt, phys_addr_t phys, - unsigned int size, int flags, unsigned int pid) +static void settlbcam(int index, unsigned long virt, phys_addr_t phys, + unsigned long size, unsigned long flags, unsigned int pid) { - unsigned int tsize, lz; + unsigned int tsize; - asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size)); - tsize = 21 - lz; + tsize = __ilog2(size) - 10; #ifdef CONFIG_SMP if ((flags & _PAGE_NO_CACHE) == 0) @@ -128,18 +129,16 @@ void settlbcam(int index, unsigned long virt, phys_addr_t phys, TLBCAM[index].MAS2 |= (flags & _PAGE_GUARDED) ? MAS2_G : 0; TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0; - TLBCAM[index].MAS3 = (phys & PAGE_MASK) | MAS3_SX | MAS3_SR; + TLBCAM[index].MAS3 = (phys & MAS3_RPN) | MAS3_SX | MAS3_SR; TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_SW : 0); + if (mmu_has_feature(MMU_FTR_BIG_PHYS)) + TLBCAM[index].MAS7 = (u64)phys >> 32; -#ifndef CONFIG_KGDB /* want user access for breakpoints */ - if (flags & _PAGE_USER) { + /* Below is unlikely -- only for large user pages or similar */ + if (pte_user(flags)) { TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR; TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0); } -#else - TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR; - TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0); -#endif tlbcam_addrs[index].start = virt; tlbcam_addrs[index].limit = virt + size - 1; @@ -148,27 +147,77 @@ void settlbcam(int index, unsigned long virt, phys_addr_t phys, loadcam_entry(index); } -void invalidate_tlbcam_entry(int index) +unsigned long calc_cam_sz(unsigned long ram, unsigned long virt, + phys_addr_t phys) { - TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index); - TLBCAM[index].MAS1 = ~MAS1_VALID; + unsigned int camsize = __ilog2(ram); + unsigned int align = __ffs(virt | phys); + unsigned long max_cam; + + if ((mfspr(SPRN_MMUCFG) & MMUCFG_MAVN) == MMUCFG_MAVN_V1) { + /* Convert (4^max) kB to (2^max) bytes */ + max_cam = ((mfspr(SPRN_TLB1CFG) >> 16) & 0xf) * 2 + 10; + camsize &= ~1U; + align &= ~1U; + } else { + /* Convert (2^max) kB to (2^max) bytes */ + max_cam = __ilog2(mfspr(SPRN_TLB1PS)) + 10; + } - loadcam_entry(index); + if (camsize > align) + camsize = align; + if (camsize > max_cam) + camsize = max_cam; + + return 1UL << camsize; } -unsigned long __init mmu_mapin_ram(void) +static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt, + unsigned long ram, int max_cam_idx) +{ + int i; + unsigned long amount_mapped = 0; + + /* Calculate CAM values */ + for (i = 0; ram && i < max_cam_idx; i++) { + unsigned long cam_sz; + + cam_sz = calc_cam_sz(ram, virt, phys); + settlbcam(i, virt, phys, cam_sz, PAGE_KERNEL_X, 0); + + ram -= cam_sz; + amount_mapped += cam_sz; + virt += cam_sz; + phys += cam_sz; + } + tlbcam_index = i; + +#ifdef CONFIG_PPC64 + get_paca()->tcd.esel_next = i; + get_paca()->tcd.esel_max = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY; + get_paca()->tcd.esel_first = i; +#endif + + return amount_mapped; +} + +unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx) { unsigned long virt = PAGE_OFFSET; phys_addr_t phys = memstart_addr; - while (cam[tlbcam_index] && tlbcam_index < ARRAY_SIZE(cam)) { - settlbcam(tlbcam_index, virt, phys, cam[tlbcam_index], PAGE_KERNEL_X, 0); - virt += cam[tlbcam_index]; - phys += cam[tlbcam_index]; - tlbcam_index++; - } + return map_mem_in_cams_addr(phys, virt, ram, max_cam_idx); +} + +#ifdef CONFIG_PPC32 + +#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS) +#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS" +#endif - return virt - PAGE_OFFSET; +unsigned long __init mmu_mapin_ram(unsigned long top) +{ + return tlbcam_addrs[tlbcam_index - 1].limit - PAGE_OFFSET + 1; } /* @@ -179,46 +228,91 @@ void __init MMU_init_hw(void) flush_instruction_cache(); } -void __init -adjust_total_lowmem(void) +void __init adjust_total_lowmem(void) { - phys_addr_t ram; - unsigned int max_cam = (mfspr(SPRN_TLB1CFG) >> 16) & 0xff; - char buf[ARRAY_SIZE(cam) * 5 + 1], *p = buf; + unsigned long ram; int i; - unsigned long virt = PAGE_OFFSET & 0xffffffffUL; - unsigned long phys = memstart_addr & 0xffffffffUL; - - /* Convert (4^max) kB to (2^max) bytes */ - max_cam = max_cam * 2 + 10; /* adjust lowmem size to __max_low_memory */ ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem); - /* Calculate CAM values */ - __max_low_memory = 0; - for (i = 0; ram && i < ARRAY_SIZE(cam); i++) { - unsigned int camsize = __ilog2(ram) & ~1U; - unsigned int align = __ffs(virt | phys) & ~1U; - - if (camsize > align) - camsize = align; - if (camsize > max_cam) - camsize = max_cam; - - cam[i] = 1UL << camsize; - ram -= cam[i]; - __max_low_memory += cam[i]; - virt += cam[i]; - phys += cam[i]; - - p += sprintf(p, "%lu/", cam[i] >> 20); - } - for (; i < ARRAY_SIZE(cam); i++) - p += sprintf(p, "0/"); - p[-1] = '\0'; + i = switch_to_as1(); + __max_low_memory = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM); + restore_to_as0(i, 0, 0, 1); - pr_info("Memory CAM mapping: %s Mb, residual: %dMb\n", buf, + pr_info("Memory CAM mapping: "); + for (i = 0; i < tlbcam_index - 1; i++) + pr_cont("%lu/", tlbcam_sz(i) >> 20); + pr_cont("%lu Mb, residual: %dMb\n", tlbcam_sz(tlbcam_index - 1) >> 20, (unsigned int)((total_lowmem - __max_low_memory) >> 20)); - __initial_memory_limit_addr = memstart_addr + __max_low_memory; + + memblock_set_current_limit(memstart_addr + __max_low_memory); +} + +void setup_initial_memory_limit(phys_addr_t first_memblock_base, + phys_addr_t first_memblock_size) +{ + phys_addr_t limit = first_memblock_base + first_memblock_size; + + /* 64M mapped initially according to head_fsl_booke.S */ + memblock_set_current_limit(min_t(u64, limit, 0x04000000)); +} + +#ifdef CONFIG_RELOCATABLE +int __initdata is_second_reloc; +notrace void __init relocate_init(u64 dt_ptr, phys_addr_t start) +{ + unsigned long base = KERNELBASE; + + kernstart_addr = start; + if (is_second_reloc) { + virt_phys_offset = PAGE_OFFSET - memstart_addr; + return; + } + + /* + * Relocatable kernel support based on processing of dynamic + * relocation entries. Before we get the real memstart_addr, + * We will compute the virt_phys_offset like this: + * virt_phys_offset = stext.run - kernstart_addr + * + * stext.run = (KERNELBASE & ~0x3ffffff) + + * (kernstart_addr & 0x3ffffff) + * When we relocate, we have : + * + * (kernstart_addr & 0x3ffffff) = (stext.run & 0x3ffffff) + * + * hence: + * virt_phys_offset = (KERNELBASE & ~0x3ffffff) - + * (kernstart_addr & ~0x3ffffff) + * + */ + start &= ~0x3ffffff; + base &= ~0x3ffffff; + virt_phys_offset = base - start; + early_get_first_memblock_info(__va(dt_ptr), NULL); + /* + * We now get the memstart_addr, then we should check if this + * address is the same as what the PAGE_OFFSET map to now. If + * not we have to change the map of PAGE_OFFSET to memstart_addr + * and do a second relocation. + */ + if (start != memstart_addr) { + int n; + long offset = start - memstart_addr; + + is_second_reloc = 1; + n = switch_to_as1(); + /* map a 64M area for the second relocation */ + if (memstart_addr > start) + map_mem_in_cams(0x4000000, CONFIG_LOWMEM_CAM_NUM); + else + map_mem_in_cams_addr(start, PAGE_OFFSET + offset, + 0x4000000, CONFIG_LOWMEM_CAM_NUM); + restore_to_as0(n, offset, __va(dt_ptr), 1); + /* We should never reach here */ + panic("Relocation error"); + } } +#endif +#endif |