sh: Isolate uncached mapping support.
This splits out the uncached mapping support under its own config option,
presently only used by 29-bit mode and 32-bit + PMB. This will make it
possible to optionally add an uncached mapping on sh64 as well as booting
without an uncached mapping for 32-bit.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/include/asm/ptrace.h b/arch/sh/include/asm/ptrace.h
index 201d11e..e879dff 100644
--- a/arch/sh/include/asm/ptrace.h
+++ b/arch/sh/include/asm/ptrace.h
@@ -102,13 +102,15 @@
#define PTRACE_GETDSPREGS 55 /* DSP registers */
#define PTRACE_SETDSPREGS 56
-#define PT_TEXT_END_ADDR 240
-#define PT_TEXT_ADDR 244 /* &(struct user)->start_code */
-#define PT_DATA_ADDR 248 /* &(struct user)->start_data */
+#define PT_TEXT_END_ADDR 240
+#define PT_TEXT_ADDR 244 /* &(struct user)->start_code */
+#define PT_DATA_ADDR 248 /* &(struct user)->start_data */
#define PT_TEXT_LEN 252
#ifdef __KERNEL__
#include <asm/addrspace.h>
+#include <asm/page.h>
+#include <asm/system.h>
#define user_mode(regs) (((regs)->sr & 0x40000000)==0)
#define instruction_pointer(regs) ((unsigned long)(regs)->pc)
@@ -137,9 +139,14 @@
{
unsigned long pc = instruction_pointer(regs);
-#ifdef P2SEG
- if (pc >= P2SEG && pc < P3SEG)
- pc -= 0x20000000;
+#ifdef CONFIG_UNCACHED_MAPPING
+ /*
+ * If PC points in to the uncached mapping, fix it up and hand
+ * back the cached equivalent.
+ */
+ if ((pc >= (memory_start + cached_to_uncached)) &&
+ (pc < (memory_start + cached_to_uncached + uncached_size)))
+ pc -= cached_to_uncached;
#endif
return pc;
diff --git a/arch/sh/include/asm/system.h b/arch/sh/include/asm/system.h
index 6442f17..0bd7a17 100644
--- a/arch/sh/include/asm/system.h
+++ b/arch/sh/include/asm/system.h
@@ -10,7 +10,6 @@
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/types.h>
-#include <asm/ptrace.h>
#define AT_VECTOR_SIZE_ARCH 5 /* entries in ARCH_DLINFO */
@@ -114,6 +113,8 @@
(unsigned long)_n_, sizeof(*(ptr))); \
})
+struct pt_regs;
+
extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
void free_initmem(void);
void free_initrd_mem(unsigned long start, unsigned long end);
diff --git a/arch/sh/include/asm/system_64.h b/arch/sh/include/asm/system_64.h
index 3391bb6..3633864 100644
--- a/arch/sh/include/asm/system_64.h
+++ b/arch/sh/include/asm/system_64.h
@@ -18,6 +18,7 @@
/*
* switch_to() should switch tasks to task nr n, first
*/
+struct thread_struct;
struct task_struct *sh64_switch_to(struct task_struct *prev,
struct thread_struct *prev_thread,
struct task_struct *next,