Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 188 insertions, 0 deletions

diff --git a/arch/arm/mm/cache-v4wt.S b/arch/arm/mm/cache-v4wt.S
new file mode 100644
index 000000000000..9bcabd86c6f3
--- /dev/null
+++ b/arch/arm/mm/cache-v4wt.S
@@ -0,0 +1,188 @@
+/*
+ *  linux/arch/arm/mm/cache-v4wt.S
+ *
+ *  Copyright (C) 1997-2002 Russell king
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  ARMv4 write through cache operations support.
+ *
+ *  We assume that the write buffer is not enabled.
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/hardware.h>
+#include <asm/page.h>
+#include "proc-macros.S"
+
+/*
+ * The size of one data cache line.
+ */
+#define CACHE_DLINESIZE 32
+
+/*
+ * The number of data cache segments.
+ */
+#define CACHE_DSEGMENTS 8
+
+/*
+ * The number of lines in a cache segment.
+ */
+#define CACHE_DENTRIES  64
+
+/*
+ * This is the size at which it becomes more efficient to
+ * clean the whole cache, rather than using the individual
+ * cache line maintainence instructions.
+ *
+ * *** This needs benchmarking
+ */
+#define CACHE_DLIMIT    16384
+
+/*
+ *      flush_user_cache_all()
+ *
+ *      Invalidate all cache entries in a particular address
+ *      space.
+ */
+ENTRY(v4wt_flush_user_cache_all)
+        /* FALLTHROUGH */
+/*
+ *      flush_kern_cache_all()
+ *
+ *      Clean and invalidate the entire cache.
+ */
+ENTRY(v4wt_flush_kern_cache_all)
+        mov     r2, #VM_EXEC
+        mov     ip, #0
+__flush_whole_cache:
+        tst     r2, #VM_EXEC
+        mcrne   p15, 0, ip, c7, c5, 0           @ invalidate I cache
+        mcr     p15, 0, ip, c7, c6, 0           @ invalidate D cache
+        mov     pc, lr
+
+/*
+ *      flush_user_cache_range(start, end, flags)
+ *
+ *      Clean and invalidate a range of cache entries in the specified
+ *      address space.
+ *
+ *      - start - start address (inclusive, page aligned)
+ *      - end   - end address (exclusive, page aligned)
+ *      - flags - vma_area_struct flags describing address space
+ */
+ENTRY(v4wt_flush_user_cache_range)
+        sub     r3, r1, r0                      @ calculate total size
+        cmp     r3, #CACHE_DLIMIT
+        bhs     __flush_whole_cache
+
+1:      mcr     p15, 0, r0, c7, c6, 1           @ invalidate D entry
+        tst     r2, #VM_EXEC
+        mcrne   p15, 0, r0, c7, c5, 1           @ invalidate I entry
+        add     r0, r0, #CACHE_DLINESIZE
+        cmp     r0, r1
+        blo     1b
+        mov     pc, lr
+
+/*
+ *      coherent_kern_range(start, end)
+ *
+ *      Ensure coherency between the Icache and the Dcache in the
+ *      region described by start.  If you have non-snooping
+ *      Harvard caches, you need to implement this function.
+ *
+ *      - start  - virtual start address
+ *      - end    - virtual end address
+ */
+ENTRY(v4wt_coherent_kern_range)
+        /* FALLTRHOUGH */
+
+/*
+ *      coherent_user_range(start, end)
+ *
+ *      Ensure coherency between the Icache and the Dcache in the
+ *      region described by start.  If you have non-snooping
+ *      Harvard caches, you need to implement this function.
+ *
+ *      - start  - virtual start address
+ *      - end    - virtual end address
+ */
+ENTRY(v4wt_coherent_user_range)
+        bic     r0, r0, #CACHE_DLINESIZE - 1
+1:      mcr     p15, 0, r0, c7, c5, 1           @ invalidate I entry
+        add     r0, r0, #CACHE_DLINESIZE
+        cmp     r0, r1
+        blo     1b
+        mov     pc, lr
+
+/*
+ *      flush_kern_dcache_page(void *page)
+ *
+ *      Ensure no D cache aliasing occurs, either with itself or
+ *      the I cache
+ *
+ *      - addr  - page aligned address
+ */
+ENTRY(v4wt_flush_kern_dcache_page)
+        mov     r2, #0
+        mcr     p15, 0, r2, c7, c5, 0           @ invalidate I cache
+        add     r1, r0, #PAGE_SZ
+        /* fallthrough */
+
+/*
+ *      dma_inv_range(start, end)
+ *
+ *      Invalidate (discard) the specified virtual address range.
+ *      May not write back any entries.  If 'start' or 'end'
+ *      are not cache line aligned, those lines must be written
+ *      back.
+ *
+ *      - start  - virtual start address
+ *      - end    - virtual end address
+ */
+ENTRY(v4wt_dma_inv_range)
+        bic     r0, r0, #CACHE_DLINESIZE - 1
+1:      mcr     p15, 0, r0, c7, c6, 1           @ invalidate D entry
+        add     r0, r0, #CACHE_DLINESIZE
+        cmp     r0, r1
+        blo     1b
+        /* FALLTHROUGH */
+
+/*
+ *      dma_clean_range(start, end)
+ *
+ *      Clean the specified virtual address range.
+ *
+ *      - start  - virtual start address
+ *      - end    - virtual end address
+ */
+ENTRY(v4wt_dma_clean_range)
+        mov     pc, lr
+
+/*
+ *      dma_flush_range(start, end)
+ *
+ *      Clean and invalidate the specified virtual address range.
+ *
+ *      - start  - virtual start address
+ *      - end    - virtual end address
+ */
+        .globl  v4wt_dma_flush_range
+        .equ    v4wt_dma_flush_range, v4wt_dma_inv_range
+
+        __INITDATA
+
+        .type   v4wt_cache_fns, #object
+ENTRY(v4wt_cache_fns)
+        .long   v4wt_flush_kern_cache_all
+        .long   v4wt_flush_user_cache_all
+        .long   v4wt_flush_user_cache_range
+        .long   v4wt_coherent_kern_range
+        .long   v4wt_coherent_user_range
+        .long   v4wt_flush_kern_dcache_page
+        .long   v4wt_dma_inv_range
+        .long   v4wt_dma_clean_range
+        .long   v4wt_dma_flush_range
+        .size   v4wt_cache_fns, . - v4wt_cache_fns