1 files changed, 257 insertions, 0 deletions
diff --git a/arch/score/mm/cache.c b/arch/score/mm/cache.c
new file mode 100644
index 00000000000..dbac9d9dfdd
--- /dev/null
+++ b/arch/score/mm/cache.c
@@ -0,0 +1,257 @@
+/*
+ * arch/score/mm/cache.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Lennox Wu <lennox.wu@sunplusct.com>
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+
+#include <asm/mmu_context.h>
+
+/*
+Just flush entire Dcache!!
+You must ensure the page doesn't include instructions, because
+the function will not flush the Icache.
+The addr must be cache aligned.
+*/
+static void flush_data_cache_page(unsigned long addr)
+{
+	unsigned int i;
+	for (i = 0; i < (PAGE_SIZE / L1_CACHE_BYTES); i += L1_CACHE_BYTES) {
+		__asm__ __volatile__(
+		"cache 0x0e, [%0, 0]\n"
+		"cache 0x1a, [%0, 0]\n"
+		"nop\n"
+		: : "r" (addr));
+		addr += L1_CACHE_BYTES;
+	}
+}
+
+/* called by update_mmu_cache. */
+void __update_cache(struct vm_area_struct *vma, unsigned long address,
+		pte_t pte)
+{
+	struct page *page;
+	unsigned long pfn, addr;
+	int exec = (vma->vm_flags & VM_EXEC);
+
+	pfn = pte_pfn(pte);
+	if (unlikely(!pfn_valid(pfn)))
+		return;
+	page = pfn_to_page(pfn);
+	if (page_mapping(page) && test_bit(PG_arch_1, &page->flags)) {
+		addr = (unsigned long) page_address(page);
+		if (exec)
+			flush_data_cache_page(addr);
+		clear_bit(PG_arch_1, &page->flags);
+	}
+}
+
+static inline void setup_protection_map(void)
+{
+	protection_map[0] = PAGE_NONE;
+	protection_map[1] = PAGE_READONLY;
+	protection_map[2] = PAGE_COPY;
+	protection_map[3] = PAGE_COPY;
+	protection_map[4] = PAGE_READONLY;
+	protection_map[5] = PAGE_READONLY;
+	protection_map[6] = PAGE_COPY;
+	protection_map[7] = PAGE_COPY;
+	protection_map[8] = PAGE_NONE;
+	protection_map[9] = PAGE_READONLY;
+	protection_map[10] = PAGE_SHARED;
+	protection_map[11] = PAGE_SHARED;
+	protection_map[12] = PAGE_READONLY;
+	protection_map[13] = PAGE_READONLY;
+	protection_map[14] = PAGE_SHARED;
+	protection_map[15] = PAGE_SHARED;
+}
+
+void __devinit cpu_cache_init(void)
+{
+	setup_protection_map();
+}
+
+void flush_icache_all(void)
+{
+	__asm__ __volatile__(
+	"la r8, flush_icache_all\n"
+	"cache 0x10, [r8, 0]\n"
+	"nop\nnop\nnop\nnop\nnop\nnop\n"
+	: : : "r8");
+}
+
+void flush_dcache_all(void)
+{
+	__asm__ __volatile__(
+	"la r8, flush_dcache_all\n"
+	"cache 0x1f, [r8, 0]\n"
+	"nop\nnop\nnop\nnop\nnop\nnop\n"
+	"cache 0x1a, [r8, 0]\n"
+	"nop\nnop\nnop\nnop\nnop\nnop\n"
+	: : : "r8");
+}
+
+void flush_cache_all(void)
+{
+	__asm__ __volatile__(
+	"la r8, flush_cache_all\n"
+	"cache 0x10, [r8, 0]\n"
+	"nop\nnop\nnop\nnop\nnop\nnop\n"
+	"cache 0x1f, [r8, 0]\n"
+	"nop\nnop\nnop\nnop\nnop\nnop\n"
+	"cache 0x1a, [r8, 0]\n"
+	"nop\nnop\nnop\nnop\nnop\nnop\n"
+	: : : "r8");
+}
+
+void flush_cache_mm(struct mm_struct *mm)
+{
+	if (!(mm->context))
+		return;
+	flush_cache_all();
+}
+
+/*if we flush a range precisely , the processing may be very long.
+We must check each page in the range whether present. If the page is present,
+we can flush the range in the page. Be careful, the range may be cross two
+page, a page is present and another is not present.
+*/
+/*
+The interface is provided in hopes that the port can find
+a suitably efficient method for removing multiple page
+sized regions from the cache.
+*/
+void flush_cache_range(struct vm_area_struct *vma,
+		unsigned long start, unsigned long end)
+{
+	struct mm_struct *mm = vma->vm_mm;
+	int exec = vma->vm_flags & VM_EXEC;
+	pgd_t *pgdp;
+	pud_t *pudp;
+	pmd_t *pmdp;
+	pte_t *ptep;
+
+	if (!(mm->context))
+		return;
+
+	pgdp = pgd_offset(mm, start);
+	pudp = pud_offset(pgdp, start);
+	pmdp = pmd_offset(pudp, start);
+	ptep = pte_offset(pmdp, start);
+
+	while (start <= end) {
+		unsigned long tmpend;
+		pgdp = pgd_offset(mm, start);
+		pudp = pud_offset(pgdp, start);
+		pmdp = pmd_offset(pudp, start);
+		ptep = pte_offset(pmdp, start);
+
+		if (!(pte_val(*ptep) & _PAGE_PRESENT)) {
+			start = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
+			continue;
+		}
+		tmpend = (start | (PAGE_SIZE-1)) > end ?
+				 end : (start | (PAGE_SIZE-1));
+
+		flush_dcache_range(start, tmpend);
+		if (exec)
+			flush_icache_range(start, tmpend);
+		start = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
+	}
+}
+
+void flush_cache_page(struct vm_area_struct *vma,
+		unsigned long addr, unsigned long pfn)
+{
+	int exec = vma->vm_flags & VM_EXEC;
+	unsigned long kaddr = 0xa0000000 | (pfn << PAGE_SHIFT);
+
+	flush_dcache_range(kaddr, kaddr + PAGE_SIZE);
+
+	if (exec)
+		flush_icache_range(kaddr, kaddr + PAGE_SIZE);
+}
+
+void flush_cache_sigtramp(unsigned long addr)
+{
+	__asm__ __volatile__(
+	"cache 0x02, [%0, 0]\n"
+	"nop\nnop\nnop\nnop\nnop\n"
+	"cache 0x02, [%0, 0x4]\n"
+	"nop\nnop\nnop\nnop\nnop\n"
+
+	"cache 0x0d, [%0, 0]\n"
+	"nop\nnop\nnop\nnop\nnop\n"
+	"cache 0x0d, [%0, 0x4]\n"
+	"nop\nnop\nnop\nnop\nnop\n"
+
+	"cache 0x1a, [%0, 0]\n"
+	"nop\nnop\nnop\nnop\nnop\n"
+	: : "r" (addr));
+}
+
+/*
+1. WB and invalid a cache line of Dcache
+2. Drain Write Buffer
+the range must be smaller than PAGE_SIZE
+*/
+void flush_dcache_range(unsigned long start, unsigned long end)
+{
+	int size, i;
+
+	start = start & ~(L1_CACHE_BYTES - 1);
+	end = end & ~(L1_CACHE_BYTES - 1);
+	size = end - start;
+	/* flush dcache to ram, and invalidate dcache lines. */
+	for (i = 0; i < size; i += L1_CACHE_BYTES) {
+		__asm__ __volatile__(
+		"cache 0x0e, [%0, 0]\n"
+		"nop\nnop\nnop\nnop\nnop\n"
+		"cache 0x1a, [%0, 0]\n"
+		"nop\nnop\nnop\nnop\nnop\n"
+		: : "r" (start));
+		start += L1_CACHE_BYTES;
+	}
+}
+
+void flush_icache_range(unsigned long start, unsigned long end)
+{
+	int size, i;
+	start = start & ~(L1_CACHE_BYTES - 1);
+	end = end & ~(L1_CACHE_BYTES - 1);
+
+	size = end - start;
+	/* invalidate icache lines. */
+	for (i = 0; i < size; i += L1_CACHE_BYTES) {
+		__asm__ __volatile__(
+		"cache 0x02, [%0, 0]\n"
+		"nop\nnop\nnop\nnop\nnop\n"
+		: : "r" (start));
+		start += L1_CACHE_BYTES;
+	}
+}