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ArmPkg: Add comments to ArmEnableVFP 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11740 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
oliviermartin 2011-06-03 09:25:51 +00:00
parent f0fef790ff
commit 4705b7da4b
2 changed files with 14 additions and 8 deletions
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11
ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.S
View File

@ -316,12 +316,15 @@ ASM_PFX(ArmWriteCPACR):
bx lr
ASM_PFX(ArmEnableVFP):
# Enable VFP registers
# Read CPACR (Coprocessor Access Control Register)
mrc p15, 0, r0, c1, c0, 2
orr r0, r0, #0x00f00000 @ Enable VPF access (V* instructions)
# Enable VPF access (Full Access to CP10, CP11) (V* instructions)
orr r0, r0, #0x00f00000
# Write back CPACR (Coprocessor Access Control Register)
mcr p15, 0, r0, c1, c0, 2
mov r0, #0x40000000 @ Set EN bit in FPEXC
mcr p10,#0x7,r0,c8,c0,#0 @ msr FPEXC,r0 in ARM assembly
# Set EN bit in FPEXC. The Advanced SIMD and VFP extensions are enabled and operate normally.
mov r0, #0x40000000
mcr p10,#0x7,r0,c8,c0,#0
bx lr
ASM_PFX(ArmCallWFI):

11
ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.asm
View File

@ -314,12 +314,15 @@ ArmWriteCPACR
bx lr
ArmEnableVFP
// Enable VFP registers
// Read CPACR (Coprocessor Access Control Register)
mrc p15, 0, r0, c1, c0, 2
orr r0, r0, #0x00f00000 // Enable VPF access (V* instructions)
// Enable VPF access (Full Access to CP10, CP11) (V* instructions)
orr r0, r0, #0x00f00000
// Write back CPACR (Coprocessor Access Control Register)
mcr p15, 0, r0, c1, c0, 2
mov r0, #0x40000000 // Set EN bit in FPEXC
mcr p10,#0x7,r0,c8,c0,#0 // msr FPEXC,r0 in ARM assembly
// Set EN bit in FPEXC. The Advanced SIMD and VFP extensions are enabled and operate normally.
mov r0, #0x40000000
mcr p10,#0x7,r0,c8,c0,#0
bx lr
ArmCallWFI