powerpc: Add PACA fields specific to 64-bit Book3E processors

This adds various fields in the PACA that are for use specifically
by Book3E processors, such as exception save areas, current pgd
pointer, special exceptions kernel stacks etc...

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index c8a3cbf..b634456 100644 (file)
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -14,9 +14,11 @@
 #define _ASM_POWERPC_PACA_H
 #ifdef __KERNEL__
 
-#include       <asm/types.h>
-#include       <asm/lppaca.h>
-#include       <asm/mmu.h>
+#include <asm/types.h>
+#include <asm/lppaca.h>
+#include <asm/mmu.h>
+#include <asm/page.h>
+#include <asm/exception-64e.h>
 
 register struct paca_struct *local_paca asm("r13");
 
@@ -91,6 +93,21 @@ struct paca_struct {
        u16 slb_cache[SLB_CACHE_ENTRIES];
 #endif /* CONFIG_PPC_STD_MMU_64 */
 
+#ifdef CONFIG_PPC_BOOK3E
+       pgd_t *pgd;                     /* Current PGD */
+       pgd_t *kernel_pgd;              /* Kernel PGD */
+       u64 exgen[8] __attribute__((aligned(0x80)));
+       u64 extlb[EX_TLB_SIZE*3] __attribute__((aligned(0x80)));
+       u64 exmc[8];            /* used for machine checks */
+       u64 excrit[8];          /* used for crit interrupts */
+       u64 exdbg[8];           /* used for debug interrupts */
+
+       /* Kernel stack pointers for use by special exceptions */
+       void *mc_kstack;
+       void *crit_kstack;
+       void *dbg_kstack;
+#endif /* CONFIG_PPC_BOOK3E */
+
        mm_context_t context;
 
        /*

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 0a9f30b..b9e010d 100644 (file)
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -140,6 +140,20 @@ int main(void)
                                            context.high_slices_psize));
        DEFINE(MMUPSIZEDEFSIZE, sizeof(struct mmu_psize_def));
 #endif /* CONFIG_PPC_MM_SLICES */
+
+#ifdef CONFIG_PPC_BOOK3E
+       DEFINE(PACAPGD, offsetof(struct paca_struct, pgd));
+       DEFINE(PACA_KERNELPGD, offsetof(struct paca_struct, kernel_pgd));
+       DEFINE(PACA_EXGEN, offsetof(struct paca_struct, exgen));
+       DEFINE(PACA_EXTLB, offsetof(struct paca_struct, extlb));
+       DEFINE(PACA_EXMC, offsetof(struct paca_struct, exmc));
+       DEFINE(PACA_EXCRIT, offsetof(struct paca_struct, excrit));
+       DEFINE(PACA_EXDBG, offsetof(struct paca_struct, exdbg));
+       DEFINE(PACA_MC_STACK, offsetof(struct paca_struct, mc_kstack));
+       DEFINE(PACA_CRIT_STACK, offsetof(struct paca_struct, crit_kstack));
+       DEFINE(PACA_DBG_STACK, offsetof(struct paca_struct, dbg_kstack));
+#endif /* CONFIG_PPC_BOOK3E */
+
 #ifdef CONFIG_PPC_STD_MMU_64
        DEFINE(PACASTABREAL, offsetof(struct paca_struct, stab_real));
        DEFINE(PACASTABVIRT, offsetof(struct paca_struct, stab_addr));

diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index e9962c7..d16b1ea 100644 (file)
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -13,6 +13,7 @@
 #include <asm/lppaca.h>
 #include <asm/paca.h>
 #include <asm/sections.h>
+#include <asm/pgtable.h>
 
 /* This symbol is provided by the linker - let it fill in the paca
  * field correctly */
@@ -87,6 +88,8 @@ void __init initialise_pacas(void)
 
 #ifdef CONFIG_PPC_BOOK3S
                new_paca->lppaca_ptr = &lppaca[cpu];
+#else
+               new_paca->kernel_pgd = swapper_pg_dir;
 #endif
                new_paca->lock_token = 0x8000;
                new_paca->paca_index = cpu;