![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
212 lines
4.7 KiB
C
212 lines
4.7 KiB
C
/*
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* Dump R4x00 TLB for debugging purposes.
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*
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* Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
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* Copyright (C) 1999 by Silicon Graphics, Inc.
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <asm/bootinfo.h>
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#include <asm/cachectl.h>
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#include <asm/cpu.h>
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#include <asm/mipsregs.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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static inline const char *msk2str(unsigned int mask)
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{
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switch (mask) {
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case PM_4K: return "4kb";
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case PM_16K: return "16kb";
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case PM_64K: return "64kb";
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case PM_256K: return "256kb";
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#ifndef CONFIG_CPU_VR41XX
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case PM_1M: return "1Mb";
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case PM_4M: return "4Mb";
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case PM_16M: return "16Mb";
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case PM_64M: return "64Mb";
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case PM_256M: return "256Mb";
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#endif
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}
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return "unknown";
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}
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#define BARRIER() \
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__asm__ __volatile__( \
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".set\tnoreorder\n\t" \
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"nop;nop;nop;nop;nop;nop;nop\n\t" \
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".set\treorder");
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void dump_tlb(int first, int last)
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{
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unsigned long s_entryhi, entryhi, entrylo0, entrylo1, asid;
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unsigned int s_index, pagemask, c0, c1, i;
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s_entryhi = read_c0_entryhi();
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s_index = read_c0_index();
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asid = s_entryhi & 0xff;
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for (i = first; i <= last; i++) {
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write_c0_index(i);
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BARRIER();
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tlb_read();
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BARRIER();
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pagemask = read_c0_pagemask();
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entryhi = read_c0_entryhi();
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entrylo0 = read_c0_entrylo0();
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entrylo1 = read_c0_entrylo1();
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/* Unused entries have a virtual address of CKSEG0. */
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if ((entryhi & ~0x1ffffUL) != CKSEG0
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&& (entryhi & 0xff) == asid) {
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/*
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* Only print entries in use
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*/
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printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
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c0 = (entrylo0 >> 3) & 7;
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c1 = (entrylo1 >> 3) & 7;
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printk("va=%011lx asid=%02lx\n",
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(entryhi & ~0x1fffUL),
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entryhi & 0xff);
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printk("\t[pa=%011lx c=%d d=%d v=%d g=%ld] ",
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(entrylo0 << 6) & PAGE_MASK, c0,
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(entrylo0 & 4) ? 1 : 0,
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(entrylo0 & 2) ? 1 : 0,
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(entrylo0 & 1));
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printk("[pa=%011lx c=%d d=%d v=%d g=%ld]\n",
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(entrylo1 << 6) & PAGE_MASK, c1,
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(entrylo1 & 4) ? 1 : 0,
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(entrylo1 & 2) ? 1 : 0,
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(entrylo1 & 1));
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}
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}
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printk("\n");
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write_c0_entryhi(s_entryhi);
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write_c0_index(s_index);
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}
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void dump_tlb_all(void)
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{
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dump_tlb(0, current_cpu_data.tlbsize - 1);
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}
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void dump_tlb_wired(void)
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{
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int wired;
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wired = read_c0_wired();
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printk("Wired: %d", wired);
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dump_tlb(0, read_c0_wired());
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}
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void dump_tlb_addr(unsigned long addr)
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{
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unsigned int flags, oldpid;
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int index;
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local_irq_save(flags);
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oldpid = read_c0_entryhi() & 0xff;
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BARRIER();
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write_c0_entryhi((addr & PAGE_MASK) | oldpid);
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BARRIER();
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tlb_probe();
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BARRIER();
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index = read_c0_index();
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write_c0_entryhi(oldpid);
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local_irq_restore(flags);
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if (index < 0) {
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printk("No entry for address 0x%08lx in TLB\n", addr);
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return;
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}
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printk("Entry %d maps address 0x%08lx\n", index, addr);
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dump_tlb(index, index);
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}
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void dump_tlb_nonwired(void)
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{
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dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1);
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}
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void dump_list_process(struct task_struct *t, void *address)
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{
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pgd_t *page_dir, *pgd;
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pmd_t *pmd;
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pte_t *pte, page;
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unsigned long addr, val;
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addr = (unsigned long) address;
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printk("Addr == %08lx\n", addr);
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printk("tasks->mm.pgd == %08lx\n", (unsigned long) t->mm->pgd);
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page_dir = pgd_offset(t->mm, 0);
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printk("page_dir == %016lx\n", (unsigned long) page_dir);
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pgd = pgd_offset(t->mm, addr);
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printk("pgd == %016lx\n", (unsigned long) pgd);
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pmd = pmd_offset(pgd, addr);
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printk("pmd == %016lx\n", (unsigned long) pmd);
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pte = pte_offset(pmd, addr);
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printk("pte == %016lx\n", (unsigned long) pte);
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page = *pte;
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printk("page == %08lx\n", pte_val(page));
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val = pte_val(page);
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if (val & _PAGE_PRESENT) printk("present ");
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if (val & _PAGE_READ) printk("read ");
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if (val & _PAGE_WRITE) printk("write ");
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if (val & _PAGE_ACCESSED) printk("accessed ");
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if (val & _PAGE_MODIFIED) printk("modified ");
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if (val & _PAGE_R4KBUG) printk("r4kbug ");
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if (val & _PAGE_GLOBAL) printk("global ");
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if (val & _PAGE_VALID) printk("valid ");
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printk("\n");
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}
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void dump_list_current(void *address)
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{
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dump_list_process(current, address);
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}
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unsigned int vtop(void *address)
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{
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pgd_t *pgd;
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pmd_t *pmd;
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pte_t *pte;
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unsigned int addr, paddr;
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addr = (unsigned long) address;
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pgd = pgd_offset(current->mm, addr);
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pmd = pmd_offset(pgd, addr);
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pte = pte_offset(pmd, addr);
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paddr = (CKSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
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paddr |= (addr & ~PAGE_MASK);
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return paddr;
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}
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void dump16(unsigned long *p)
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{
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int i;
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for (i = 0; i < 8; i++) {
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printk("*%08lx == %08lx, ", (unsigned long)p, *p);
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p++;
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printk("*%08lx == %08lx\n", (unsigned long)p, *p);
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p++;
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}
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}
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