63c89da242
Once a hot-added CPU finishes the SMBASE relocation, we need to pen it in a HLT loop. Add the NASM implementation (with just a handful of instructions, but much documentation), and some C language helper functions. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Michael Kinney <michael.d.kinney@intel.com> Cc: Philippe Mathieu-Daudé <philmd@redhat.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1512 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20200226221156.29589-12-lersek@redhat.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/** @file
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SMBASE relocation for hot-plugged CPUs.
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Copyright (c) 2020, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h> // BASE_1MB
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#include <Library/BaseMemoryLib.h> // CopyMem()
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#include <Library/DebugLib.h> // DEBUG()
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#include "Smbase.h"
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extern CONST UINT8 mPostSmmPen[];
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extern CONST UINT16 mPostSmmPenSize;
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/**
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Allocate a non-SMRAM reserved memory page for the Post-SMM Pen for hot-added
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CPUs.
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This function may only be called from the entry point function of the driver.
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@param[out] PenAddress The address of the allocated (normal RAM) reserved
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page.
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@param[in] BootServices Pointer to the UEFI boot services table. Used for
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allocating the normal RAM (not SMRAM) reserved page.
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@retval EFI_SUCCESS Allocation successful.
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@retval EFI_BAD_BUFFER_SIZE The Post-SMM Pen template is not smaller than
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EFI_PAGE_SIZE.
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@return Error codes propagated from underlying services.
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DEBUG_ERROR messages have been logged. No
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resources have been allocated.
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**/
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EFI_STATUS
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SmbaseAllocatePostSmmPen (
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OUT UINT32 *PenAddress,
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IN CONST EFI_BOOT_SERVICES *BootServices
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)
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{
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EFI_STATUS Status;
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EFI_PHYSICAL_ADDRESS Address;
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//
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// The pen code must fit in one page, and the last byte must remain free for
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// signaling the SMM Monarch.
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//
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if (mPostSmmPenSize >= EFI_PAGE_SIZE) {
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Status = EFI_BAD_BUFFER_SIZE;
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DEBUG ((DEBUG_ERROR, "%a: mPostSmmPenSize=%u: %r\n", __FUNCTION__,
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mPostSmmPenSize, Status));
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return Status;
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}
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Address = BASE_1MB - 1;
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Status = BootServices->AllocatePages (AllocateMaxAddress,
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EfiReservedMemoryType, 1, &Address);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_ERROR, "%a: AllocatePages(): %r\n", __FUNCTION__, Status));
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return Status;
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}
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DEBUG ((DEBUG_INFO, "%a: Post-SMM Pen at 0x%Lx\n", __FUNCTION__, Address));
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*PenAddress = (UINT32)Address;
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return EFI_SUCCESS;
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}
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/**
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Copy the Post-SMM Pen template code into the reserved page allocated with
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SmbaseAllocatePostSmmPen().
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Note that this effects an "SMRAM to normal RAM" copy.
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The SMM Monarch is supposed to call this function from the root MMI handler.
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@param[in] PenAddress The allocation address returned by
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SmbaseAllocatePostSmmPen().
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**/
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VOID
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SmbaseReinstallPostSmmPen (
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IN UINT32 PenAddress
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)
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{
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CopyMem ((VOID *)(UINTN)PenAddress, mPostSmmPen, mPostSmmPenSize);
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}
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/**
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Release the reserved page allocated with SmbaseAllocatePostSmmPen().
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This function may only be called from the entry point function of the driver,
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on the error path.
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@param[in] PenAddress The allocation address returned by
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SmbaseAllocatePostSmmPen().
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@param[in] BootServices Pointer to the UEFI boot services table. Used for
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releasing the normal RAM (not SMRAM) reserved page.
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**/
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VOID
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SmbaseReleasePostSmmPen (
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IN UINT32 PenAddress,
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IN CONST EFI_BOOT_SERVICES *BootServices
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)
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{
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BootServices->FreePages (PenAddress, 1);
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}
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