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powerpc/85xx: Add AltiVec support for e6500 

The e6500 core adds support for AltiVec on a Book-E class processor.
Connect up all the various exception handling code and build config
mechanisms to allow user spaces apps to utilize AltiVec.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
hifive-unleashed-5.1
Kumar Gala 2012-09-07 15:57:17 -05:00
parent 1b29187315
commit cd66cc2ee5
6 changed files with 75 additions and 5 deletions
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2
arch/powerpc/include/asm/cputable.h
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@ -374,7 +374,7 @@ extern const char *powerpc_base_platform;
#define CPU_FTRS_E6500 (CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | \
CPU_FTR_L2CSR | CPU_FTR_LWSYNC | CPU_FTR_NOEXECUTE | \
CPU_FTR_DBELL | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
CPU_FTR_DEBUG_LVL_EXC | CPU_FTR_EMB_HV)
CPU_FTR_DEBUG_LVL_EXC | CPU_FTR_EMB_HV | CPU_FTR_ALTIVEC_COMP)
#define CPU_FTRS_GENERIC_32 (CPU_FTR_COMMON | CPU_FTR_NODSISRALIGN)
/* 64-bit CPUs */

4
arch/powerpc/include/asm/kvm_asm.h
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@ -67,6 +67,10 @@
#define BOOKE_INTERRUPT_HV_SYSCALL 40
#define BOOKE_INTERRUPT_HV_PRIV 41
/* altivec */
#define BOOKE_INTERRUPT_ALTIVEC_UNAVAIL 42
#define BOOKE_INTERRUPT_ALTIVEC_ASSIST 43
/* book3s */
#define BOOK3S_INTERRUPT_SYSTEM_RESET 0x100

16
arch/powerpc/kernel/cpu_setup_fsl_booke.S
View File

@ -53,6 +53,15 @@ _GLOBAL(__e500_dcache_setup)
isync
blr
_GLOBAL(__setup_cpu_e6500)
mflr r6
#ifdef CONFIG_PPC64
bl .setup_altivec_ivors
#endif
bl __setup_cpu_e5500
mtlr r6
blr
#ifdef CONFIG_PPC32
_GLOBAL(__setup_cpu_e200)
/* enable dedicated debug exception handling resources (Debug APU) */
@ -107,6 +116,13 @@ _GLOBAL(__setup_cpu_e5500)
#endif
#ifdef CONFIG_PPC_BOOK3E_64
_GLOBAL(__restore_cpu_e6500)
mflr r5
bl .setup_altivec_ivors
bl __restore_cpu_e5500
mtlr r5
blr
_GLOBAL(__restore_cpu_e5500)
mflr r4
bl __e500_icache_setup

9
arch/powerpc/kernel/cputable.c
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@ -74,7 +74,9 @@ extern void __restore_cpu_a2(void);
#endif /* CONFIG_PPC64 */
#if defined(CONFIG_E500)
extern void __setup_cpu_e5500(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_e6500(unsigned long offset, struct cpu_spec* spec);
extern void __restore_cpu_e5500(void);
extern void __restore_cpu_e6500(void);
#endif /* CONFIG_E500 */
/* This table only contains "desktop" CPUs, it need to be filled with embedded
@ -2065,7 +2067,8 @@ static struct cpu_spec __initdata cpu_specs[] = {
.pvr_value = 0x80400000,
.cpu_name = "e6500",
.cpu_features = CPU_FTRS_E6500,
.cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU,
.cpu_user_features = COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU |
PPC_FEATURE_HAS_ALTIVEC_COMP,
.mmu_features = MMU_FTR_TYPE_FSL_E | MMU_FTR_BIG_PHYS |
MMU_FTR_USE_TLBILX,
.icache_bsize = 64,
@ -2073,9 +2076,9 @@ static struct cpu_spec __initdata cpu_specs[] = {
.num_pmcs = 4,
.oprofile_cpu_type = "ppc/e6500",
.oprofile_type = PPC_OPROFILE_FSL_EMB,
.cpu_setup = __setup_cpu_e5500,
.cpu_setup = __setup_cpu_e6500,
#ifndef CONFIG_PPC32
.cpu_restore = __restore_cpu_e5500,
.cpu_restore = __restore_cpu_e6500,
#endif
.machine_check = machine_check_e500mc,
.platform = "ppce6500",

47
arch/powerpc/kernel/exceptions-64e.S
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@ -299,6 +299,8 @@ interrupt_base_book3e: /* fake trap */
EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
EXCEPTION_STUB(0x1c0, data_tlb_miss)
EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
EXCEPTION_STUB(0x200, altivec_unavailable) /* 0x0f20 */
EXCEPTION_STUB(0x220, altivec_assist) /* 0x1700 */
EXCEPTION_STUB(0x260, perfmon)
EXCEPTION_STUB(0x280, doorbell)
EXCEPTION_STUB(0x2a0, doorbell_crit)
@ -395,6 +397,45 @@ interrupt_end_book3e:
bl .kernel_fp_unavailable_exception
b .ret_from_except
/* Altivec Unavailable Interrupt */
START_EXCEPTION(altivec_unavailable);
NORMAL_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_ALTIVEC_UNAVAIL,
PROLOG_ADDITION_NONE)
/* we can probably do a shorter exception entry for that one... */
EXCEPTION_COMMON(0x200, PACA_EXGEN, INTS_KEEP)
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
ld r12,_MSR(r1)
andi. r0,r12,MSR_PR;
beq- 1f
bl .load_up_altivec
b fast_exception_return
1:
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
INTS_DISABLE
bl .save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
bl .altivec_unavailable_exception
b .ret_from_except
/* AltiVec Assist */
START_EXCEPTION(altivec_assist);
NORMAL_EXCEPTION_PROLOG(0x220, BOOKE_INTERRUPT_ALTIVEC_ASSIST,
PROLOG_ADDITION_NONE)
EXCEPTION_COMMON(0x220, PACA_EXGEN, INTS_DISABLE)
bl .save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
bl .altivec_assist_exception
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#else
bl .unknown_exception
#endif
b .ret_from_except
/* Decrementer Interrupt */
MASKABLE_EXCEPTION(0x900, BOOKE_INTERRUPT_DECREMENTER,
decrementer, .timer_interrupt, ACK_DEC)
@ -807,6 +848,7 @@ fast_exception_return:
BAD_STACK_TRAMPOLINE(0x000)
BAD_STACK_TRAMPOLINE(0x100)
BAD_STACK_TRAMPOLINE(0x200)
BAD_STACK_TRAMPOLINE(0x220)
BAD_STACK_TRAMPOLINE(0x260)
BAD_STACK_TRAMPOLINE(0x280)
BAD_STACK_TRAMPOLINE(0x2a0)
@ -1350,6 +1392,11 @@ _GLOBAL(__setup_base_ivors)
blr
_GLOBAL(setup_altivec_ivors)
SET_IVOR(32, 0x200) /* AltiVec Unavailable */
SET_IVOR(33, 0x220) /* AltiVec Assist */
blr
_GLOBAL(setup_perfmon_ivor)
SET_IVOR(35, 0x260) /* Performance Monitor */
blr

2
arch/powerpc/platforms/Kconfig.cputype
View File

@ -232,7 +232,7 @@ config PHYS_64BIT
config ALTIVEC
bool "AltiVec Support"
depends on 6xx || POWER4
depends on 6xx || POWER4 || (PPC_E500MC && PPC64)
---help---
This option enables kernel support for the Altivec extensions to the
PowerPC processor. The kernel currently supports saving and restoring