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| author | Catalin Marinas <catalin.marinas@arm.com> | 2008-01-10 19:16:17 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-01-26 14:44:02 +0000 |
| commit | b5872db4a2ebe7dbc7a5e4013ae8ee37f3de3b97 (patch) | |
| tree | eab14c59c2b068868a5f53a56eb149fc1f902b13 | |
| parent | 25ebee020bd34d1f4c5678538204f0b10bf9f6d5 (diff) | |
| download | linux-b5872db4a2ebe7dbc7a5e4013ae8ee37f3de3b97.tar.gz | |
[ARM] 4584/2: ARMv7: Add Advanced SIMD (NEON) extension support
This patch enables the use of the Advanced SIMD (NEON) extension on
ARMv7. The NEON technology is a 64/128-bit hybrid SIMD architecture
for accelerating the performance of multimedia and signal processing
applications. The extension shares the registers with the VFP unit and
enabling/disabling and saving/restoring follow the same rules. In
addition, there are instructions that do not have the appropriate CP
number encoded, the checks being made in the call_fpe function.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/Kconfig | 7 | ||||
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 38 |
2 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index f4eeb03bc6a9..709f9d383c87 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -966,6 +966,13 @@ config VFPv3 depends on VFP default y if CPU_V7 +config NEON + bool "Advanced SIMD (NEON) Extension support" + depends on VFPv3 && CPU_V7 + help + Say Y to include support code for NEON, the ARMv7 Advanced SIMD + Extension. + endmenu menu "Userspace binary formats" diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 29dec080a604..8de21f51e48c 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -480,6 +480,13 @@ __und_usr: * co-processor instructions. However, we have to watch out * for the ARM6/ARM7 SWI bug. * + * NEON is a special case that has to be handled here. Not all + * NEON instructions are co-processor instructions, so we have + * to make a special case of checking for them. Plus, there's + * five groups of them, so we have a table of mask/opcode pairs + * to check against, and if any match then we branch off into the + * NEON handler code. + * * Emulators may wish to make use of the following registers: * r0 = instruction opcode. * r2 = PC+4 @@ -488,6 +495,23 @@ __und_usr: * lr = unrecognised instruction return address */ call_fpe: +#ifdef CONFIG_NEON + adr r6, .LCneon_opcodes +2: + ldr r7, [r6], #4 @ mask value + cmp r7, #0 @ end mask? + beq 1f + and r8, r0, r7 + ldr r7, [r6], #4 @ opcode bits matching in mask + cmp r8, r7 @ NEON instruction? + bne 2b + get_thread_info r10 + mov r7, #1 + strb r7, [r10, #TI_USED_CP + 10] @ mark CP#10 as used + strb r7, [r10, #TI_USED_CP + 11] @ mark CP#11 as used + b do_vfp @ let VFP handler handle this +1: +#endif tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27 #if defined(CONFIG_CPU_ARM610) || defined(CONFIG_CPU_ARM710) and r8, r0, #0x0f000000 @ mask out op-code bits @@ -537,6 +561,20 @@ call_fpe: mov pc, lr @ CP#14 (Debug) mov pc, lr @ CP#15 (Control) +#ifdef CONFIG_NEON + .align 6 + +.LCneon_opcodes: + .word 0xfe000000 @ mask + .word 0xf2000000 @ opcode + + .word 0xff100000 @ mask + .word 0xf4000000 @ opcode + + .word 0x00000000 @ mask + .word 0x00000000 @ opcode +#endif + do_fpe: enable_irq ldr r4, .LCfp |