Linux-2.6.12-rc2
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!
diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
new file mode 100644
index 0000000..ab833ad
--- /dev/null
+++ b/arch/sh/mm/cache-sh4.c
@@ -0,0 +1,362 @@
+/*
+ * arch/sh/mm/cache-sh4.c
+ *
+ * Copyright (C) 1999, 2000, 2002 Niibe Yutaka
+ * Copyright (C) 2001, 2002, 2003, 2004 Paul Mundt
+ * Copyright (C) 2003 Richard Curnow
+ *
+ * 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.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/threads.h>
+#include <asm/addrspace.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/cache.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+
+extern void __flush_cache_4096_all(unsigned long start);
+static void __flush_cache_4096_all_ex(unsigned long start);
+extern void __flush_dcache_all(void);
+static void __flush_dcache_all_ex(void);
+
+/*
+ * SH-4 has virtually indexed and physically tagged cache.
+ */
+
+struct semaphore p3map_sem[4];
+
+void __init p3_cache_init(void)
+{
+ if (remap_area_pages(P3SEG, 0, PAGE_SIZE*4, _PAGE_CACHABLE))
+ panic("%s failed.", __FUNCTION__);
+
+ sema_init (&p3map_sem[0], 1);
+ sema_init (&p3map_sem[1], 1);
+ sema_init (&p3map_sem[2], 1);
+ sema_init (&p3map_sem[3], 1);
+}
+
+/*
+ * Write back the dirty D-caches, but not invalidate them.
+ *
+ * START: Virtual Address (U0, P1, or P3)
+ * SIZE: Size of the region.
+ */
+void __flush_wback_region(void *start, int size)
+{
+ unsigned long v;
+ unsigned long begin, end;
+
+ begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+ end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+ & ~(L1_CACHE_BYTES-1);
+ for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+ asm volatile("ocbwb %0"
+ : /* no output */
+ : "m" (__m(v)));
+ }
+}
+
+/*
+ * Write back the dirty D-caches and invalidate them.
+ *
+ * START: Virtual Address (U0, P1, or P3)
+ * SIZE: Size of the region.
+ */
+void __flush_purge_region(void *start, int size)
+{
+ unsigned long v;
+ unsigned long begin, end;
+
+ begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+ end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+ & ~(L1_CACHE_BYTES-1);
+ for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+ asm volatile("ocbp %0"
+ : /* no output */
+ : "m" (__m(v)));
+ }
+}
+
+
+/*
+ * No write back please
+ */
+void __flush_invalidate_region(void *start, int size)
+{
+ unsigned long v;
+ unsigned long begin, end;
+
+ begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
+ end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
+ & ~(L1_CACHE_BYTES-1);
+ for (v = begin; v < end; v+=L1_CACHE_BYTES) {
+ asm volatile("ocbi %0"
+ : /* no output */
+ : "m" (__m(v)));
+ }
+}
+
+static void __flush_dcache_all_ex(void)
+{
+ unsigned long addr, end_addr, entry_offset;
+
+ end_addr = CACHE_OC_ADDRESS_ARRAY + (cpu_data->dcache.sets << cpu_data->dcache.entry_shift) * cpu_data->dcache.ways;
+ entry_offset = 1 << cpu_data->dcache.entry_shift;
+ for (addr = CACHE_OC_ADDRESS_ARRAY; addr < end_addr; addr += entry_offset) {
+ ctrl_outl(0, addr);
+ }
+}
+
+static void __flush_cache_4096_all_ex(unsigned long start)
+{
+ unsigned long addr, entry_offset;
+ int i;
+
+ entry_offset = 1 << cpu_data->dcache.entry_shift;
+ for (i = 0; i < cpu_data->dcache.ways; i++, start += cpu_data->dcache.way_incr) {
+ for (addr = CACHE_OC_ADDRESS_ARRAY + start;
+ addr < CACHE_OC_ADDRESS_ARRAY + 4096 + start;
+ addr += entry_offset) {
+ ctrl_outl(0, addr);
+ }
+ }
+}
+
+void flush_cache_4096_all(unsigned long start)
+{
+ if (cpu_data->dcache.ways == 1)
+ __flush_cache_4096_all(start);
+ else
+ __flush_cache_4096_all_ex(start);
+}
+
+/*
+ * Write back the range of D-cache, and purge the I-cache.
+ *
+ * Called from kernel/module.c:sys_init_module and routine for a.out format.
+ */
+void flush_icache_range(unsigned long start, unsigned long end)
+{
+ flush_cache_all();
+}
+
+/*
+ * Write back the D-cache and purge the I-cache for signal trampoline.
+ * .. which happens to be the same behavior as flush_icache_range().
+ * So, we simply flush out a line.
+ */
+void flush_cache_sigtramp(unsigned long addr)
+{
+ unsigned long v, index;
+ unsigned long flags;
+ int i;
+
+ v = addr & ~(L1_CACHE_BYTES-1);
+ asm volatile("ocbwb %0"
+ : /* no output */
+ : "m" (__m(v)));
+
+ index = CACHE_IC_ADDRESS_ARRAY | (v & cpu_data->icache.entry_mask);
+
+ local_irq_save(flags);
+ jump_to_P2();
+ for(i = 0; i < cpu_data->icache.ways; i++, index += cpu_data->icache.way_incr)
+ ctrl_outl(0, index); /* Clear out Valid-bit */
+ back_to_P1();
+ local_irq_restore(flags);
+}
+
+static inline void flush_cache_4096(unsigned long start,
+ unsigned long phys)
+{
+ unsigned long flags;
+ extern void __flush_cache_4096(unsigned long addr, unsigned long phys, unsigned long exec_offset);
+
+ /*
+ * SH7751, SH7751R, and ST40 have no restriction to handle cache.
+ * (While SH7750 must do that at P2 area.)
+ */
+ if ((cpu_data->flags & CPU_HAS_P2_FLUSH_BUG)
+ || start < CACHE_OC_ADDRESS_ARRAY) {
+ local_irq_save(flags);
+ __flush_cache_4096(start | SH_CACHE_ASSOC, P1SEGADDR(phys), 0x20000000);
+ local_irq_restore(flags);
+ } else {
+ __flush_cache_4096(start | SH_CACHE_ASSOC, P1SEGADDR(phys), 0);
+ }
+}
+
+/*
+ * Write back & invalidate the D-cache of the page.
+ * (To avoid "alias" issues)
+ */
+void flush_dcache_page(struct page *page)
+{
+ if (test_bit(PG_mapped, &page->flags)) {
+ unsigned long phys = PHYSADDR(page_address(page));
+
+ /* Loop all the D-cache */
+ flush_cache_4096(CACHE_OC_ADDRESS_ARRAY, phys);
+ flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x1000, phys);
+ flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x2000, phys);
+ flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x3000, phys);
+ }
+}
+
+static inline void flush_icache_all(void)
+{
+ unsigned long flags, ccr;
+
+ local_irq_save(flags);
+ jump_to_P2();
+
+ /* Flush I-cache */
+ ccr = ctrl_inl(CCR);
+ ccr |= CCR_CACHE_ICI;
+ ctrl_outl(ccr, CCR);
+
+ back_to_P1();
+ local_irq_restore(flags);
+}
+
+void flush_cache_all(void)
+{
+ if (cpu_data->dcache.ways == 1)
+ __flush_dcache_all();
+ else
+ __flush_dcache_all_ex();
+ flush_icache_all();
+}
+
+void flush_cache_mm(struct mm_struct *mm)
+{
+ /* Is there any good way? */
+ /* XXX: possibly call flush_cache_range for each vm area */
+ /*
+ * FIXME: Really, the optimal solution here would be able to flush out
+ * individual lines created by the specified context, but this isn't
+ * feasible for a number of architectures (such as MIPS, and some
+ * SPARC) .. is this possible for SuperH?
+ *
+ * In the meantime, we'll just flush all of the caches.. this
+ * seems to be the simplest way to avoid at least a few wasted
+ * cache flushes. -Lethal
+ */
+ flush_cache_all();
+}
+
+/*
+ * Write back and invalidate I/D-caches for the page.
+ *
+ * ADDR: Virtual Address (U0 address)
+ * PFN: Physical page number
+ */
+void flush_cache_page(struct vm_area_struct *vma, unsigned long address, unsigned long pfn)
+{
+ unsigned long phys = pfn << PAGE_SHIFT;
+
+ /* We only need to flush D-cache when we have alias */
+ if ((address^phys) & CACHE_ALIAS) {
+ /* Loop 4K of the D-cache */
+ flush_cache_4096(
+ CACHE_OC_ADDRESS_ARRAY | (address & CACHE_ALIAS),
+ phys);
+ /* Loop another 4K of the D-cache */
+ flush_cache_4096(
+ CACHE_OC_ADDRESS_ARRAY | (phys & CACHE_ALIAS),
+ phys);
+ }
+
+ if (vma->vm_flags & VM_EXEC)
+ /* Loop 4K (half) of the I-cache */
+ flush_cache_4096(
+ CACHE_IC_ADDRESS_ARRAY | (address & 0x1000),
+ phys);
+}
+
+/*
+ * Write back and invalidate D-caches.
+ *
+ * START, END: Virtual Address (U0 address)
+ *
+ * NOTE: We need to flush the _physical_ page entry.
+ * Flushing the cache lines for U0 only isn't enough.
+ * We need to flush for P1 too, which may contain aliases.
+ */
+void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ unsigned long p = start & PAGE_MASK;
+ pgd_t *dir;
+ pmd_t *pmd;
+ pte_t *pte;
+ pte_t entry;
+ unsigned long phys;
+ unsigned long d = 0;
+
+ dir = pgd_offset(vma->vm_mm, p);
+ pmd = pmd_offset(dir, p);
+
+ do {
+ if (pmd_none(*pmd) || pmd_bad(*pmd)) {
+ p &= ~((1 << PMD_SHIFT) -1);
+ p += (1 << PMD_SHIFT);
+ pmd++;
+ continue;
+ }
+ pte = pte_offset_kernel(pmd, p);
+ do {
+ entry = *pte;
+ if ((pte_val(entry) & _PAGE_PRESENT)) {
+ phys = pte_val(entry)&PTE_PHYS_MASK;
+ if ((p^phys) & CACHE_ALIAS) {
+ d |= 1 << ((p & CACHE_ALIAS)>>12);
+ d |= 1 << ((phys & CACHE_ALIAS)>>12);
+ if (d == 0x0f)
+ goto loop_exit;
+ }
+ }
+ pte++;
+ p += PAGE_SIZE;
+ } while (p < end && ((unsigned long)pte & ~PAGE_MASK));
+ pmd++;
+ } while (p < end);
+ loop_exit:
+ if (d & 1)
+ flush_cache_4096_all(0);
+ if (d & 2)
+ flush_cache_4096_all(0x1000);
+ if (d & 4)
+ flush_cache_4096_all(0x2000);
+ if (d & 8)
+ flush_cache_4096_all(0x3000);
+ if (vma->vm_flags & VM_EXEC)
+ flush_icache_all();
+}
+
+/*
+ * flush_icache_user_range
+ * @vma: VMA of the process
+ * @page: page
+ * @addr: U0 address
+ * @len: length of the range (< page size)
+ */
+void flush_icache_user_range(struct vm_area_struct *vma,
+ struct page *page, unsigned long addr, int len)
+{
+ flush_cache_page(vma, addr, page_to_pfn(page));
+}
+