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authorPaul Mundt <lethal@linux-sh.org>2007-12-10 15:50:28 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-01-28 13:18:59 +0900
commitcd01204b82933754a7276838656420477f64d4b8 (patch)
treef9e3b11574bec04cda78c549cdc5c37c3c75c4a5 /arch/sh/kernel
parentc8c0a1aba9fa8f816dc8fb477ff816a5b700f0ea (diff)
downloadop-kernel-dev-cd01204b82933754a7276838656420477f64d4b8.zip
op-kernel-dev-cd01204b82933754a7276838656420477f64d4b8.tar.gz
sh: Encode L1/L2 cache shape in auxvt.
This adds in the L1I/L1D/L2 cache shape support to their respective entries in the ELF auxvt, based on the Alpha implementation. We use this on the userspace libc side for calculating a tightly packed SHMLBA amongst other things. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel')
-rw-r--r--arch/sh/kernel/cpu/init.c29
-rw-r--r--arch/sh/kernel/setup.c3
2 files changed, 31 insertions, 1 deletions
diff --git a/arch/sh/kernel/cpu/init.c b/arch/sh/kernel/cpu/init.c
index 0f0c76a..80a3132 100644
--- a/arch/sh/kernel/cpu/init.c
+++ b/arch/sh/kernel/cpu/init.c
@@ -13,6 +13,7 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
+#include <linux/log2.h>
#include <asm/mmu_context.h>
#include <asm/processor.h>
#include <asm/uaccess.h>
@@ -20,6 +21,7 @@
#include <asm/system.h>
#include <asm/cacheflush.h>
#include <asm/cache.h>
+#include <asm/elf.h>
#include <asm/io.h>
#include <asm/smp.h>
#ifdef CONFIG_SUPERH32
@@ -151,6 +153,27 @@ static void __uses_jump_to_uncached cache_init(void)
#define cache_init() do { } while (0)
#endif
+#define CSHAPE(totalsize, linesize, assoc) \
+ ((totalsize & ~0xff) | (linesize << 4) | assoc)
+
+#define CACHE_DESC_SHAPE(desc) \
+ CSHAPE((desc).way_size * (desc).ways, ilog2((desc).linesz), (desc).ways)
+
+static void detect_cache_shape(void)
+{
+ l1d_cache_shape = CACHE_DESC_SHAPE(current_cpu_data.dcache);
+
+ if (current_cpu_data.dcache.flags & SH_CACHE_COMBINED)
+ l1i_cache_shape = l1d_cache_shape;
+ else
+ l1i_cache_shape = CACHE_DESC_SHAPE(current_cpu_data.icache);
+
+ if (current_cpu_data.flags & CPU_HAS_L2_CACHE)
+ l2_cache_shape = CACHE_DESC_SHAPE(current_cpu_data.scache);
+ else
+ l2_cache_shape = -1; /* No S-cache */
+}
+
#ifdef CONFIG_SH_DSP
static void __init release_dsp(void)
{
@@ -237,11 +260,15 @@ asmlinkage void __cpuinit sh_cpu_init(void)
/* Init the cache */
cache_init();
- if (raw_smp_processor_id() == 0)
+ if (raw_smp_processor_id() == 0) {
shm_align_mask = max_t(unsigned long,
current_cpu_data.dcache.way_size - 1,
PAGE_SIZE - 1);
+ /* Boot CPU sets the cache shape */
+ detect_cache_shape();
+ }
+
/* Disable the FPU */
if (fpu_disabled) {
printk("FPU Disabled\n");
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index f48ce8e..9c105c8 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -26,6 +26,7 @@
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/page.h>
+#include <asm/elf.h>
#include <asm/sections.h>
#include <asm/irq.h>
#include <asm/setup.h>
@@ -78,6 +79,8 @@ EXPORT_SYMBOL(memory_start);
unsigned long memory_end = 0;
EXPORT_SYMBOL(memory_end);
+int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
+
static int __init early_parse_mem(char *p)
{
unsigned long size;
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