On 10/20/17 15:00, Leif Lindholm wrote: > On Fri, Oct 20, 2017 at 12:23:25PM +0100, Ard Biesheuvel wrote: >> DEBUG builds of PEI code will print a diagnostic message regarding >> the utilization of temporary RAM before switching to permanent RAM. >> For example, >> >> Total temporary memory: 16352 bytes. >> temporary memory stack ever used: 4820 bytes. >> temporary memory heap used for HobList: 4720 bytes. >> >> Tracking stack utilization like this requires the stack to be seeded >> with a known magic value, and this needs to occur before entering C >> code, given that it uses the stack. Currently, only Nt32Pkg appears >> to implement this feature, but it is useful nonetheless, so let's >> wire it up for PrePeiCore. >> >> Contributed-under: TianoCore Contribution Agreement 1.1 >> Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org> >> --- >> ArmPlatformPkg/PrePeiCore/AArch64/PrePeiCoreEntryPoint.S | 7 +++++++ >> ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.S | 10 ++++++++++ >> ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.asm | 10 ++++++++++ >> 3 files changed, 27 insertions(+) >> >> diff --git a/ArmPlatformPkg/PrePeiCore/AArch64/PrePeiCoreEntryPoint.S >> b/ArmPlatformPkg/PrePeiCore/AArch64/PrePeiCoreEntryPoint.S >> index aab5edab0c42..7a33e2754869 100644 >> --- a/ArmPlatformPkg/PrePeiCore/AArch64/PrePeiCoreEntryPoint.S >> +++ b/ArmPlatformPkg/PrePeiCore/AArch64/PrePeiCoreEntryPoint.S >> @@ -13,6 +13,8 @@ >> >> #include <AsmMacroIoLibV8.h> >> >> +#define INIT_CAR_VALUE 0x5AA55AA55AA55AA5 >> + >> ASM_FUNC(_ModuleEntryPoint) >> // Do early platform specific actions >> bl ASM_PFX(ArmPlatformPeiBootAction) >> @@ -84,4 +86,9 @@ _PrepareArguments: >> >> _SetupPrimaryCoreStack: >> mov sp, x1 >> + MOV64 (x8, FixedPcdGet64(PcdCPUCoresStackBase)) >> + MOV64 (x9, INIT_CAR_VALUE) >> +0:stp x9, x9, [x8], #16 >> + cmp x8, x1 >> + b.lt 0b >> b _PrepareArguments >> diff --git a/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.S >> b/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.S >> index 14344425ad4c..7342e49bea59 100644 >> --- a/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.S >> +++ b/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.S >> @@ -13,6 +13,8 @@ >> >> #include <AsmMacroIoLib.h> >> >> +#define INIT_CAR_VALUE 0x5AA55AA5 >> + > > Worth moving to a common header somewhere? > > Also defined/used in MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c.
Furthermore, open-coded in: EmulatorPkg/Unix/Host/Host.c: *StackPointer = 0x5AA55AA5; Nt32Pkg/Sec/SecMain.c: *StackPointer = 0x5AA55AA5; Honestly I think it should be a Fixed-At-Build PCD, in MdeModulePkg.dec, similarly to gEfiMdePkgTokenSpaceGuid.PcdDebugClearMemoryValue in MdePkg.dec. I'm unhappy that we have to annoy Ard with a request to "upstream" this constant to MdeModulePkg in some form, but we'll need it yet again in OVMF... > > That file has an explicit comment saying "temporary memory is filled > with this initial value during SEC phase". Should this end have a > corresponding comment saying "checked for during PEI phase"? Thanks Laszlo > > / > Leif > >> ASM_FUNC(_ModuleEntryPoint) >> // Do early platform specific actions >> bl ASM_PFX(ArmPlatformPeiBootAction) >> @@ -65,6 +67,14 @@ _PrepareArguments: >> >> _SetupPrimaryCoreStack: >> mov sp, r1 >> + MOV32 (r8, FixedPcdGet64(PcdCPUCoresStackBase)) >> + MOV32 (r9, INIT_CAR_VALUE) >> + mov r10, r9 >> + mov r11, r9 >> + mov r12, r9 >> +0:stm r8!, {r9-r12} >> + cmp r8, r1 >> + blt 0b >> b _PrepareArguments >> >> _NeverReturn: >> diff --git a/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.asm >> b/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.asm >> index abea675828df..7455de8aa66e 100644 >> --- a/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.asm >> +++ b/ArmPlatformPkg/PrePeiCore/Arm/PrePeiCoreEntryPoint.asm >> @@ -13,6 +13,8 @@ >> >> #include <AutoGen.h> >> >> +#define INIT_CAR_VALUE 0x5AA55AA5 >> + >> INCLUDE AsmMacroIoLib.inc >> >> IMPORT CEntryPoint >> @@ -79,6 +81,14 @@ _PrepareArguments >> >> _SetupPrimaryCoreStack >> mov sp, r1 >> + mov32 r8, FixedPcdGet64(PcdCPUCoresStackBase) >> + mov32 r9, INIT_CAR_VALUE >> + mov r10, r9 >> + mov r11, r9 >> + mov r12, r9 >> +0:stm r8!, {r9-r12} >> + cmp r8, r1 >> + blt 0b >> b _PrepareArguments >> >> _NeverReturn >> -- >> 2.11.0 >> _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel