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authorMichael Neuling <mikey@neuling.org>2006-08-07 16:19:19 +1000
committerPaul Mackerras <paulus@samba.org>2006-08-08 17:08:56 +1000
commit2f6093c84730b4bad65bcd0f2f904a5769b1dfc5 (patch)
treeab4e64a0520e944062f418e91706ff968e23a6ea /arch/powerpc/kernel/paca.c
parent452b5e21216011f2f068e80443568f5f3f3f4d63 (diff)
[POWERPC] Implement SLB shadow buffer
This adds a shadow buffer for the SLBs and regsiters it with PHYP. Only the bolted SLB entries (top 3) are shadowed. The SLB shadow buffer tells the hypervisor what the kernel needs to have in the SLB for the kernel to be able to function. The hypervisor can use this information to speed up partition context switches. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/paca.c')
-rw-r--r--arch/powerpc/kernel/paca.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index c68741fed14..55f1a25085c 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -17,6 +17,7 @@
#include <asm/lppaca.h>
#include <asm/iseries/it_lp_reg_save.h>
#include <asm/paca.h>
+#include <asm/mmu.h>
/* This symbol is provided by the linker - let it fill in the paca
@@ -45,6 +46,17 @@ struct lppaca lppaca[] = {
},
};
+/*
+ * 3 persistent SLBs are registered here. The buffer will be zero
+ * initially, hence will all be invaild until we actually write them.
+ */
+struct slb_shadow slb_shadow[] __cacheline_aligned = {
+ [0 ... (NR_CPUS-1)] = {
+ .persistent = SLB_NUM_BOLTED,
+ .buffer_length = sizeof(struct slb_shadow),
+ },
+};
+
/* The Paca is an array with one entry per processor. Each contains an
* lppaca, which contains the information shared between the
* hypervisor and Linux.
@@ -59,7 +71,8 @@ struct lppaca lppaca[] = {
.lock_token = 0x8000, \
.paca_index = (number), /* Paca Index */ \
.kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL, \
- .hw_cpu_id = 0xffff,
+ .hw_cpu_id = 0xffff, \
+ .slb_shadow_ptr = &slb_shadow[number],
#ifdef CONFIG_PPC_ISERIES
#define PACA_INIT_ISERIES(number) \