c-r3k.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:8k
- /*
- * r2300.c: R2000 and R3000 specific mmu/cache code.
- *
- * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
- *
- * with a lot of changes to make this thing work for R3000s
- * Tx39XX R4k style caches added. HK
- * Copyright (C) 1998, 1999, 2000 Harald Koerfgen
- * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
- */
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/mm.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/mmu_context.h>
- #include <asm/system.h>
- #include <asm/isadep.h>
- #include <asm/io.h>
- #include <asm/bootinfo.h>
- #include <asm/cpu.h>
- static unsigned long icache_size, dcache_size; /* Size in bytes */
- static unsigned long icache_lsize, dcache_lsize; /* Size in bytes */
- #undef DEBUG_CACHE
- unsigned long __init r3k_cache_size(unsigned long ca_flags)
- {
- unsigned long flags, status, dummy, size;
- volatile unsigned long *p;
- p = (volatile unsigned long *) KSEG0;
- flags = read_32bit_cp0_register(CP0_STATUS);
- /* isolate cache space */
- write_32bit_cp0_register(CP0_STATUS, (ca_flags|flags)&~ST0_IEC);
- *p = 0xa5a55a5a;
- dummy = *p;
- status = read_32bit_cp0_register(CP0_STATUS);
- if (dummy != 0xa5a55a5a || (status & ST0_CM)) {
- size = 0;
- } else {
- for (size = 128; size <= 0x40000; size <<= 1)
- *(p + size) = 0;
- *p = -1;
- for (size = 128;
- (size <= 0x40000) && (*(p + size) == 0);
- size <<= 1)
- ;
- if (size > 0x40000)
- size = 0;
- }
- write_32bit_cp0_register(CP0_STATUS, flags);
- return size * sizeof(*p);
- }
- unsigned long __init r3k_cache_lsize(unsigned long ca_flags)
- {
- unsigned long flags, status, lsize, i;
- volatile unsigned long *p;
- p = (volatile unsigned long *) KSEG0;
- flags = read_32bit_cp0_register(CP0_STATUS);
- /* isolate cache space */
- write_32bit_cp0_register(CP0_STATUS, (ca_flags|flags)&~ST0_IEC);
- for (i = 0; i < 128; i++)
- *(p + i) = 0;
- *(volatile unsigned char *)p = 0;
- for (lsize = 1; lsize < 128; lsize <<= 1) {
- *(p + lsize);
- status = read_32bit_cp0_register(CP0_STATUS);
- if (!(status & ST0_CM))
- break;
- }
- for (i = 0; i < 128; i += lsize)
- *(volatile unsigned char *)(p + i) = 0;
- write_32bit_cp0_register(CP0_STATUS, flags);
- return lsize * sizeof(*p);
- }
- static void __init r3k_probe_cache(void)
- {
- dcache_size = r3k_cache_size(ST0_ISC);
- if (dcache_size)
- dcache_lsize = r3k_cache_lsize(ST0_ISC);
- icache_size = r3k_cache_size(ST0_ISC|ST0_SWC);
- if (icache_size)
- icache_lsize = r3k_cache_lsize(ST0_ISC|ST0_SWC);
- }
- static void r3k_flush_icache_range(unsigned long start, unsigned long end)
- {
- unsigned long size, i, flags;
- volatile unsigned char *p;
- size = end - start;
- if (size > icache_size || KSEGX(start) != KSEG0) {
- start = KSEG0;
- size = icache_size;
- }
- p = (char *)start;
- flags = read_32bit_cp0_register(CP0_STATUS);
- /* isolate cache space */
- write_32bit_cp0_register(CP0_STATUS, (ST0_ISC|ST0_SWC|flags)&~ST0_IEC);
- for (i = 0; i < size; i += 0x080) {
- asm ( "sbt$0, 0x000(%0)nt"
- "sbt$0, 0x004(%0)nt"
- "sbt$0, 0x008(%0)nt"
- "sbt$0, 0x00c(%0)nt"
- "sbt$0, 0x010(%0)nt"
- "sbt$0, 0x014(%0)nt"
- "sbt$0, 0x018(%0)nt"
- "sbt$0, 0x01c(%0)nt"
- "sbt$0, 0x020(%0)nt"
- "sbt$0, 0x024(%0)nt"
- "sbt$0, 0x028(%0)nt"
- "sbt$0, 0x02c(%0)nt"
- "sbt$0, 0x030(%0)nt"
- "sbt$0, 0x034(%0)nt"
- "sbt$0, 0x038(%0)nt"
- "sbt$0, 0x03c(%0)nt"
- "sbt$0, 0x040(%0)nt"
- "sbt$0, 0x044(%0)nt"
- "sbt$0, 0x048(%0)nt"
- "sbt$0, 0x04c(%0)nt"
- "sbt$0, 0x050(%0)nt"
- "sbt$0, 0x054(%0)nt"
- "sbt$0, 0x058(%0)nt"
- "sbt$0, 0x05c(%0)nt"
- "sbt$0, 0x060(%0)nt"
- "sbt$0, 0x064(%0)nt"
- "sbt$0, 0x068(%0)nt"
- "sbt$0, 0x06c(%0)nt"
- "sbt$0, 0x070(%0)nt"
- "sbt$0, 0x074(%0)nt"
- "sbt$0, 0x078(%0)nt"
- "sbt$0, 0x07c(%0)nt"
- : : "r" (p) );
- p += 0x080;
- }
- write_32bit_cp0_register(CP0_STATUS, flags);
- }
- static void r3k_flush_dcache_range(unsigned long start, unsigned long end)
- {
- unsigned long size, i, flags;
- volatile unsigned char *p;
- size = end - start;
- if (size > dcache_size || KSEGX(start) != KSEG0) {
- start = KSEG0;
- size = dcache_size;
- }
- p = (char *)start;
- flags = read_32bit_cp0_register(CP0_STATUS);
- /* isolate cache space */
- write_32bit_cp0_register(CP0_STATUS, (ST0_ISC|flags)&~ST0_IEC);
- for (i = 0; i < size; i += 0x080) {
- asm ( "sbt$0, 0x000(%0)nt"
- "sbt$0, 0x004(%0)nt"
- "sbt$0, 0x008(%0)nt"
- "sbt$0, 0x00c(%0)nt"
- "sbt$0, 0x010(%0)nt"
- "sbt$0, 0x014(%0)nt"
- "sbt$0, 0x018(%0)nt"
- "sbt$0, 0x01c(%0)nt"
- "sbt$0, 0x020(%0)nt"
- "sbt$0, 0x024(%0)nt"
- "sbt$0, 0x028(%0)nt"
- "sbt$0, 0x02c(%0)nt"
- "sbt$0, 0x030(%0)nt"
- "sbt$0, 0x034(%0)nt"
- "sbt$0, 0x038(%0)nt"
- "sbt$0, 0x03c(%0)nt"
- "sbt$0, 0x040(%0)nt"
- "sbt$0, 0x044(%0)nt"
- "sbt$0, 0x048(%0)nt"
- "sbt$0, 0x04c(%0)nt"
- "sbt$0, 0x050(%0)nt"
- "sbt$0, 0x054(%0)nt"
- "sbt$0, 0x058(%0)nt"
- "sbt$0, 0x05c(%0)nt"
- "sbt$0, 0x060(%0)nt"
- "sbt$0, 0x064(%0)nt"
- "sbt$0, 0x068(%0)nt"
- "sbt$0, 0x06c(%0)nt"
- "sbt$0, 0x070(%0)nt"
- "sbt$0, 0x074(%0)nt"
- "sbt$0, 0x078(%0)nt"
- "sbt$0, 0x07c(%0)nt"
- : : "r" (p) );
- p += 0x080;
- }
- write_32bit_cp0_register(CP0_STATUS,flags);
- }
- static inline unsigned long get_phys_page (unsigned long addr,
- struct mm_struct *mm)
- {
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- unsigned long physpage;
- pgd = pgd_offset(mm, addr);
- pmd = pmd_offset(pgd, addr);
- pte = pte_offset(pmd, addr);
- if ((physpage = pte_val(*pte)) & _PAGE_VALID)
- return KSEG0ADDR(physpage & PAGE_MASK);
- return 0;
- }
- static inline void r3k_flush_cache_all(void)
- {
- }
- static inline void r3k___flush_cache_all(void)
- {
- r3k_flush_icache_range(KSEG0, KSEG0 + icache_size);
- }
- static void r3k_flush_cache_mm(struct mm_struct *mm)
- {
- }
- static void r3k_flush_cache_range(struct mm_struct *mm, unsigned long start,
- unsigned long end)
- {
- }
- static void r3k_flush_cache_page(struct vm_area_struct *vma,
- unsigned long page)
- {
- }
- static void r3k_flush_page_to_ram(struct page * page)
- {
- /*
- * Nothing to be done
- */
- }
- static void r3k_flush_icache_page(struct vm_area_struct *vma, struct page *page)
- {
- struct mm_struct *mm = vma->vm_mm;
- unsigned long physpage;
- if (mm->context == 0)
- return;
- if (!(vma->vm_flags & VM_EXEC))
- return;
- #ifdef DEBUG_CACHE
- printk("cpage[%d,%08lx]", (int)mm->context, page);
- #endif
- physpage = (unsigned long) page_address(page);
- if (physpage)
- r3k_flush_icache_range(physpage, physpage + PAGE_SIZE);
- }
- static void r3k_flush_cache_sigtramp(unsigned long addr)
- {
- unsigned long flags;
- #ifdef DEBUG_CACHE
- printk("csigtramp[%08lx]", addr);
- #endif
- flags = read_32bit_cp0_register(CP0_STATUS);
- write_32bit_cp0_register(CP0_STATUS, flags&~ST0_IEC);
- /* Fill the TLB to avoid an exception with caches isolated. */
- asm ( "lwt$0, 0x000(%0)nt"
- "lwt$0, 0x004(%0)nt"
- : : "r" (addr) );
- write_32bit_cp0_register(CP0_STATUS, (ST0_ISC|ST0_SWC|flags)&~ST0_IEC);
- asm ( "sbt$0, 0x000(%0)nt"
- "sbt$0, 0x004(%0)nt"
- : : "r" (addr) );
- write_32bit_cp0_register(CP0_STATUS, flags);
- }
- static void r3k_dma_cache_wback_inv(unsigned long start, unsigned long size)
- {
- iob();
- r3k_flush_dcache_range(start, start + size);
- }
- void __init ld_mmu_r23000(void)
- {
- unsigned long config;
- _clear_page = r3k_clear_page;
- _copy_page = r3k_copy_page;
- r3k_probe_cache();
- _flush_cache_all = r3k_flush_cache_all;
- ___flush_cache_all = r3k___flush_cache_all;
- _flush_cache_mm = r3k_flush_cache_mm;
- _flush_cache_range = r3k_flush_cache_range;
- _flush_cache_page = r3k_flush_cache_page;
- _flush_cache_sigtramp = r3k_flush_cache_sigtramp;
- _flush_page_to_ram = r3k_flush_page_to_ram;
- _flush_icache_page = r3k_flush_icache_page;
- _flush_icache_range = r3k_flush_icache_range;
- _dma_cache_wback_inv = r3k_dma_cache_wback_inv;
- printk("Primary instruction cache %dkb, linesize %d bytesn",
- (int) (icache_size >> 10), (int) icache_lsize);
- printk("Primary data cache %dkb, linesize %d bytesn",
- (int) (dcache_size >> 10), (int) dcache_lsize);
- }