From 842f2fedcdc4f9ea8e6ac5b2222971c31666dd3e Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Fri, 30 Oct 2009 05:47:17 +0000 Subject: Make head_64.S aware of KVM real mode code We need to run some KVM trampoline code in real mode. Unfortunately, real mode only covers 8MB on Cell so we need to squeeze ourselves as low as possible. Also, we need to trap interrupts to get us back from guest state to host state without telling Linux about it. This patch adds interrupt traps and includes the KVM code that requires real mode in the real mode parts of Linux. Signed-off-by: Alexander Graf Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/exceptions-64s.S | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/powerpc/kernel/exceptions-64s.S') diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 1808876..fc3ead0 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -41,6 +41,7 @@ __start_interrupts: . = 0x200 _machine_check_pSeries: HMT_MEDIUM + DO_KVM 0x200 mtspr SPRN_SPRG_SCRATCH0,r13 /* save r13 */ EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common) @@ -48,6 +49,7 @@ _machine_check_pSeries: .globl data_access_pSeries data_access_pSeries: HMT_MEDIUM + DO_KVM 0x300 mtspr SPRN_SPRG_SCRATCH0,r13 BEGIN_FTR_SECTION mfspr r13,SPRN_SPRG_PACA @@ -77,6 +79,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_SLB) .globl data_access_slb_pSeries data_access_slb_pSeries: HMT_MEDIUM + DO_KVM 0x380 mtspr SPRN_SPRG_SCRATCH0,r13 mfspr r13,SPRN_SPRG_PACA /* get paca address into r13 */ std r3,PACA_EXSLB+EX_R3(r13) @@ -115,6 +118,7 @@ data_access_slb_pSeries: .globl instruction_access_slb_pSeries instruction_access_slb_pSeries: HMT_MEDIUM + DO_KVM 0x480 mtspr SPRN_SPRG_SCRATCH0,r13 mfspr r13,SPRN_SPRG_PACA /* get paca address into r13 */ std r3,PACA_EXSLB+EX_R3(r13) @@ -154,6 +158,7 @@ instruction_access_slb_pSeries: .globl system_call_pSeries system_call_pSeries: HMT_MEDIUM + DO_KVM 0xc00 BEGIN_FTR_SECTION cmpdi r0,0x1ebe beq- 1f @@ -186,12 +191,15 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) * trickery is thus necessary */ . = 0xf00 + DO_KVM 0xf00 b performance_monitor_pSeries . = 0xf20 + DO_KVM 0xf20 b altivec_unavailable_pSeries . = 0xf40 + DO_KVM 0xf40 b vsx_unavailable_pSeries #ifdef CONFIG_CBE_RAS -- cgit v1.1