diff options
Diffstat (limited to 'target/linux/realtek/files/arch/rlx/mm/init.c')
| -rw-r--r-- | target/linux/realtek/files/arch/rlx/mm/init.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/target/linux/realtek/files/arch/rlx/mm/init.c b/target/linux/realtek/files/arch/rlx/mm/init.c new file mode 100644 index 000000000..0d24ff1d6 --- /dev/null +++ b/target/linux/realtek/files/arch/rlx/mm/init.c @@ -0,0 +1,360 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1994 - 2000 Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com + * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. + */ +#include <linux/bug.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/pagemap.h> +#include <linux/ptrace.h> +#include <linux/mman.h> +#include <linux/mm.h> +#include <linux/bootmem.h> +#include <linux/highmem.h> +#include <linux/swap.h> +#include <linux/proc_fs.h> +#include <linux/pfn.h> + +#include <asm/asm-offsets.h> +#include <asm/bootinfo.h> +#include <asm/cachectl.h> +#include <asm/cpu.h> +#include <asm/dma.h> +#include <asm/kmap_types.h> +#include <asm/mmu_context.h> +#include <asm/sections.h> +#include <asm/pgtable.h> +#include <asm/pgalloc.h> +#include <asm/tlb.h> +#include <asm/fixmap.h> + +/* Atomicity and interruptability */ +#define ENTER_CRITICAL(flags) local_irq_save(flags) +#define EXIT_CRITICAL(flags) local_irq_restore(flags) + +DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); + +/* + * We have up to 8 empty zeroed pages so we can map one of the right colour + * when needed. This is necessary only on R4000 / R4400 SC and MC versions + * where we have to avoid VCED / VECI exceptions for good performance at + * any price. Since page is never written to after the initialization we + * don't have to care about aliases on other CPUs. + */ +unsigned long empty_zero_page, zero_page_mask; +EXPORT_SYMBOL_GPL(empty_zero_page); + +/* + * Not static inline because used by IP27 special magic initialization code + */ +unsigned long setup_zero_pages(void) +{ + unsigned int order; + unsigned long size; + struct page *page; + + order = 0; + + empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); + if (!empty_zero_page) + panic("Oh boy, that early out of memory?"); + + page = virt_to_page((void *)empty_zero_page); + split_page(page, order); + while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) { + SetPageReserved(page); + page++; + } + + size = PAGE_SIZE << order; + zero_page_mask = (size - 1) & PAGE_MASK; + + return 1UL << order; +} + +static inline void kmap_coherent_init(void) {} + +void *kmap_coherent(struct page *page, unsigned long addr) +{ + enum fixed_addresses idx; + unsigned long vaddr, flags, entrylo; + unsigned long old_ctx; + pte_t pte; + int tlbidx; + + BUG_ON(Page_dcache_dirty(page)); + + inc_preempt_count(); + idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1); + vaddr = __fix_to_virt(FIX_CMAP_END - idx); + pte = mk_pte(page, PAGE_KERNEL); + entrylo = pte_val(pte) >> 6; + + ENTER_CRITICAL(flags); + old_ctx = read_c0_entryhi(); + write_c0_entryhi(vaddr & (PAGE_MASK << 1)); + write_c0_entrylo0(entrylo); + write_c0_entrylo1(entrylo); + tlbidx = read_c0_wired(); + write_c0_wired(tlbidx + 1); + write_c0_index(tlbidx); + mtc0_tlbw_hazard(); + tlb_write_indexed(); + tlbw_use_hazard(); + write_c0_entryhi(old_ctx); + EXIT_CRITICAL(flags); + + return (void*) vaddr; +} + +#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1))) + +void kunmap_coherent(void) +{ + unsigned int wired; + unsigned long flags, old_ctx; + + ENTER_CRITICAL(flags); + old_ctx = read_c0_entryhi(); + wired = read_c0_wired() - 1; + write_c0_wired(wired); + write_c0_index(wired); + write_c0_entryhi(UNIQUE_ENTRYHI(wired)); + write_c0_entrylo0(0); + write_c0_entrylo1(0); + mtc0_tlbw_hazard(); + tlb_write_indexed(); + tlbw_use_hazard(); + write_c0_entryhi(old_ctx); + EXIT_CRITICAL(flags); + + dec_preempt_count(); + preempt_check_resched(); +} + +void copy_to_user_page(struct vm_area_struct *vma, + struct page *page, unsigned long vaddr, void *dst, const void *src, + unsigned long len) +{ + memcpy(dst, src, len); + + if ((vma->vm_flags & VM_EXEC)) + flush_cache_page(vma, vaddr, page_to_pfn(page)); +} + +void copy_from_user_page(struct vm_area_struct *vma, + struct page *page, unsigned long vaddr, void *dst, const void *src, + unsigned long len) +{ + memcpy(dst, src, len); +} + +void __init fixrange_init(unsigned long start, unsigned long end, pgd_t *pgd_base) +{ +#if defined(CONFIG_HIGHMEM) + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + int i, j, k; + unsigned long vaddr; + + vaddr = start; + i = __pgd_offset(vaddr); + j = __pud_offset(vaddr); + k = __pmd_offset(vaddr); + pgd = pgd_base + i; + + for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { + pud = (pud_t *)pgd; + for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { + pmd = (pmd_t *)pud; + for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { + if (pmd_none(*pmd)) { + pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); + set_pmd(pmd, __pmd((unsigned long)pte)); + BUG_ON(pte != pte_offset_kernel(pmd, 0)); + } + vaddr += PMD_SIZE; + } + k = 0; + } + j = 0; + } +#endif +} + +#ifndef CONFIG_NEED_MULTIPLE_NODES +static int __init page_is_ram(unsigned long pagenr) +{ + int i; + + for (i = 0; i < boot_mem_map.nr_map; i++) { + unsigned long addr, end; + + if (boot_mem_map.map[i].type != BOOT_MEM_RAM) + /* not usable memory */ + continue; + + addr = PFN_UP(boot_mem_map.map[i].addr); + end = PFN_DOWN(boot_mem_map.map[i].addr + + boot_mem_map.map[i].size); + + if (pagenr >= addr && pagenr < end) + return 1; + } + + return 0; +} + +void __init paging_init(void) +{ + unsigned long max_zone_pfns[MAX_NR_ZONES]; + unsigned long lastpfn; + + pagetable_init(); + +#ifdef CONFIG_HIGHMEM + kmap_init(); +#endif + kmap_coherent_init(); + +#ifdef CONFIG_ZONE_DMA + max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; +#endif +#ifdef CONFIG_ZONE_DMA32 + max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; +#endif + max_zone_pfns[ZONE_NORMAL] = max_low_pfn; + lastpfn = max_low_pfn; +#ifdef CONFIG_HIGHMEM + max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; + lastpfn = highend_pfn; +#endif + + free_area_init_nodes(max_zone_pfns); +} + +static struct kcore_list kcore_mem, kcore_vmalloc; + +void __init mem_init(void) +{ + unsigned long codesize, reservedpages, datasize, initsize; + unsigned long tmp, ram; + +#ifdef CONFIG_HIGHMEM + max_mapnr = highend_pfn; +#else + max_mapnr = max_low_pfn; +#endif + high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); + + totalram_pages += free_all_bootmem(); + totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ + + reservedpages = ram = 0; + for (tmp = 0; tmp < max_low_pfn; tmp++) + if (page_is_ram(tmp)) { + ram++; + if (PageReserved(pfn_to_page(tmp))) + reservedpages++; + } + num_physpages = ram; + +#ifdef CONFIG_HIGHMEM + for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { + struct page *page = pfn_to_page(tmp); + + if (!page_is_ram(tmp)) { + SetPageReserved(page); + continue; + } + ClearPageReserved(page); + init_page_count(page); + __free_page(page); + totalhigh_pages++; + } + totalram_pages += totalhigh_pages; + num_physpages += totalhigh_pages; +#endif + + codesize = (unsigned long) &_etext - (unsigned long) &_text; + datasize = (unsigned long) &_edata - (unsigned long) &_etext; + initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; + + kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); + kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, + VMALLOC_END-VMALLOC_START); + + printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " + "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", + (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), + ram << (PAGE_SHIFT-10), + codesize >> 10, + reservedpages << (PAGE_SHIFT-10), + datasize >> 10, + initsize >> 10, + (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); +} +#endif /* !CONFIG_NEED_MULTIPLE_NODES */ + +void free_init_pages(const char *what, unsigned long begin, unsigned long end) +{ + unsigned long pfn; + + for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) { + struct page *page = pfn_to_page(pfn); + void *addr = phys_to_virt(PFN_PHYS(pfn)); + + ClearPageReserved(page); + init_page_count(page); + memset(addr, POISON_FREE_INITMEM, PAGE_SIZE); + __free_page(page); + totalram_pages++; + } + printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); +} + +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long start, unsigned long end) +{ + free_init_pages("initrd memory", + virt_to_phys((void *)start), + virt_to_phys((void *)end)); +} +#endif + +void __init_refok free_initmem(void) +{ + bsp_free_prom_memory(); + free_init_pages("unused kernel memory", + __pa_symbol(&__init_begin), + __pa_symbol(&__init_end)); +} + +unsigned long pgd_current[NR_CPUS]; +/* + * On 64-bit we've got three-level pagetables with a slightly + * different layout ... + */ +#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order))) + +/* + * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER + * are constants. So we use the variants from asm-offset.h until that gcc + * will officially be retired. + */ +pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER); +pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER); |