x86: uv: Add UV memory protection bios call

Add UV bios call to change memory protections.

Signed-off-by: Russ Anderson <rja@sgi.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

2 files changed, 17 insertions, 1 deletions

diff --git a/arch/x86/include/asm/uv/bios.h b/arch/x86/include/asm/uv/bios.h
index 58105c5b0b4e..a301a56d4157 100644
--- a/arch/x86/include/asm/uv/bios.h
+++ b/arch/x86/include/asm/uv/bios.h
@@ -34,7 +34,8 @@ enum uv_bios_cmd {
         UV_BIOS_GET_SN_INFO,
         UV_BIOS_FREQ_BASE,
         UV_BIOS_WATCHLIST_ALLOC,
-        UV_BIOS_WATCHLIST_FREE
+        UV_BIOS_WATCHLIST_FREE,
+        UV_BIOS_MEMPROTECT
 };
 
 /*
@@ -82,6 +83,12 @@ union uv_watchlist_u {
         };
 };
 
+enum uv_memprotect {
+        UV_MEMPROT_RESTRICT_ACCESS,
+        UV_MEMPROT_ALLOW_AMO,
+        UV_MEMPROT_ALLOW_RW
+};
+
 /*
  * bios calls have 6 parameters
  */
@@ -94,6 +101,7 @@ extern s64 uv_bios_freq_base(u64, u64 *);
 extern int uv_bios_mq_watchlist_alloc(int, void *, unsigned int,
                                         unsigned long *);
 extern int uv_bios_mq_watchlist_free(int, int);
+extern s64 uv_bios_change_memprotect(u64, u64, enum uv_memprotect);
 
 extern void uv_bios_init(void);
 
diff --git a/arch/x86/kernel/bios_uv.c b/arch/x86/kernel/bios_uv.c
index 4c02b2799216..7cf6fc3d1c10 100644
--- a/arch/x86/kernel/bios_uv.c
+++ b/arch/x86/kernel/bios_uv.c
@@ -134,6 +134,14 @@ uv_bios_mq_watchlist_free(int blade, int watchlist_num)
 }
 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
 
+s64
+uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
+{
+        return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
+                                        perms, 0, 0);
+}
+EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
+
 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
 {
         return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,