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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 12/27] ArmVirtualizationPkg: Xen/PV relocatable platformlib instance
Add a ArmPlatformLib instance that can deal with the self relocation and truly dynamic discovery of system RAM base and size. Contributed-under: TianoCore Contribution Agreement 1.0 Acked-by: Laszlo Ersek <lersek@xxxxxxxxxx> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> --- .../AARCH64/MemnodeParser.S | 232 +++++++++++++++++++++ .../AARCH64/RelocatableVirtHelper.S | 161 ++++++++++++++ .../ArmXenRelocatablePlatformLib.inf | 59 ++++++ .../ArmXenRelocatablePlatformLib/RelocatableVirt.c | 71 +++++++ .../ArmXenRelocatablePlatformLib/XenVirtMem.c | 83 ++++++++ 5 files changed, 606 insertions(+) create mode 100644 ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/AARCH64/MemnodeParser.S create mode 100644 ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/AARCH64/RelocatableVirtHelper.S create mode 100644 ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/ArmXenRelocatablePlatformLib.inf create mode 100644 ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/RelocatableVirt.c create mode 100644 ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/XenVirtMem.c diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/AARCH64/MemnodeParser.S b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/AARCH64/MemnodeParser.S new file mode 100644 index 000000000000..cce2c4800c51 --- /dev/null +++ b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/AARCH64/MemnodeParser.S @@ -0,0 +1,232 @@ +/* + * Copyright (c) 2014, Linaro Ltd. All rights reserved. + * + * This program and the accompanying materials + * are licensed and made available under the terms and conditions of the BSD License + * which accompanies this distribution. The full text of the license may be found at + * http://opensource.org/licenses/bsd-license.php + * + * THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + * WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + */ + +/* + * Theory of operation + * ------------------- + * + * This code parses a Flattened Device Tree binary (DTB) to find the base of + * system RAM. It is written in assembly so that it can be executed before a + * stack has been set up. + * + * To find the base of system RAM, we have to traverse the FDT to find a memory + * node. In the context of this implementation, the first node that has a + * device_type property with the value 'memory' and a 'reg' property is + * acceptable, and the name of the node (memory[@xxx]) is ignored, as are any + * other nodes that match the above constraints. + * + * In pseudo code, this implementation does the following: + * + * for each node { + * have_device_type = false + * have_reg = false + * + * for each property { + * if property value == 'memory' { + * if property name == 'device_type' { + * have_device_type = true + * } + * } else { + * if property name == 'reg' { + * have_reg = true + * membase = property value[0] + * memsize = property value[1] + * } + * } + * } + * if have_device_type and have_reg { + * return membase and memsize + * } + * } + * return NOT_FOUND + */ + +#define FDT_MAGIC 0xedfe0dd0 + +#define FDT_BEGIN_NODE 0x1 +#define FDT_END_NODE 0x2 +#define FDT_PROP 0x3 +#define FDT_END 0x9 + + xMEMSIZE .req x0 + xMEMBASE .req x1 + + xLR .req x8 + xDTP .req x9 + xSTRTAB .req x10 + xMEMNODE .req x11 + + .text + .align 3 +_memory: + .asciz "memory" +_reg: + .asciz "reg" +_device_type: + .asciz "device_type" + + /* + * Compare strings in x4 and x5, return in w7 + */ + .align 3 +strcmp: + ldrb w2, [x4], #1 + ldrb w3, [x5], #1 + subs w7, w2, w3 + cbz w2, 0f + cbz w3, 0f + beq strcmp +0: ret + + .globl find_memnode +find_memnode: + // preserve link register + mov xLR, x30 + mov xDTP, x0 + mov xMEMNODE, #0 + + /* + * Check the DTB magic at offset 0 + */ + movz w4, #:abs_g0_nc:FDT_MAGIC + movk w4, #:abs_g1:FDT_MAGIC + ldr w5, [xDTP] + cmp w4, w5 + bne err_invalid_magic + + /* + * Read the string offset and store it for later use + */ + ldr w4, [xDTP, #12] + rev w4, w4 + add xSTRTAB, xDTP, x4 + + /* + * Read the struct offset and add it to the DT pointer + */ + ldr w5, [xDTP, #8] + rev w5, w5 + add xDTP, xDTP, x5 + + /* + * Check current tag for FDT_BEGIN_NODE + */ + ldr w5, [xDTP] + rev w5, w5 + cmp w5, #FDT_BEGIN_NODE + bne err_unexpected_begin_tag + +begin_node: + mov xMEMNODE, #0 + add xDTP, xDTP, #4 + + /* + * Advance xDTP past NULL terminated string + */ +0: ldrb w4, [xDTP], #1 + cbnz w4, 0b + +next_tag: + add xDTP, xDTP, #3 + and xDTP, xDTP, #~3 + + /* + * Read the next tag, could be BEGIN_NODE, END_NODE, PROP, END + */ + ldr w5, [xDTP] + rev w5, w5 + cmp w5, #FDT_BEGIN_NODE + beq begin_node + cmp w5, #FDT_END_NODE + beq end_node + cmp w5, #FDT_PROP + beq prop_node + cmp w5, #FDT_END + beq err_end_of_fdt + b err_unexpected_tag + +prop_node: + /* + * If propname == 'reg', record as membase and memsize + * If propname == 'device_type' and value == 'memory', + * set the 'is_memnode' flag for this node + */ + ldr w6, [xDTP, #4] + add xDTP, xDTP, #12 + rev w6, w6 + mov x5, xDTP + adr x4, _memory + bl strcmp + + /* + * Get handle to property name + */ + ldr w5, [xDTP, #-4] + rev w5, w5 + add x5, xSTRTAB, x5 + + cbz w7, check_device_type + + /* + * Check for 'reg' property + */ + adr x4, _reg + bl strcmp + cbnz w7, inc_and_next_tag + + /* + * Extract two 64-bit quantities from the 'reg' property. These values + * will only be used if the node also turns out to have a device_type + * property with a value of 'memory'. + * + * NOTE: xDTP is only guaranteed to be 32 bit aligned, and we are most + * likely executing with the MMU off, so we cannot use 64 bit + * wide accesses here. + */ + ldp w4, w5, [xDTP] + orr xMEMBASE, x4, x5, lsl #32 + ldp w4, w5, [xDTP, #8] + orr xMEMSIZE, x4, x5, lsl #32 + rev xMEMBASE, xMEMBASE + rev xMEMSIZE, xMEMSIZE + orr xMEMNODE, xMEMNODE, #2 + b inc_and_next_tag + +check_device_type: + /* + * Check whether the current property's name is 'device_type' + */ + adr x4, _device_type + bl strcmp + cbnz w7, inc_and_next_tag + orr xMEMNODE, xMEMNODE, #1 + +inc_and_next_tag: + add xDTP, xDTP, x6 + b next_tag + +end_node: + /* + * Check for device_type = memory and reg = xxxx + * If we have both, we are done + */ + add xDTP, xDTP, #4 + cmp xMEMNODE, #3 + bne next_tag + + ret xLR + +err_invalid_magic: +err_unexpected_begin_tag: +err_unexpected_tag: +err_end_of_fdt: + wfi diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/AARCH64/RelocatableVirtHelper.S b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/AARCH64/RelocatableVirtHelper.S new file mode 100644 index 000000000000..58071b5ae62a --- /dev/null +++ b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/AARCH64/RelocatableVirtHelper.S @@ -0,0 +1,161 @@ +# +# Copyright (c) 2011-2013, ARM Limited. All rights reserved. +# +# This program and the accompanying materials +# are licensed and made available under the terms and conditions of the BSD License +# which accompanies this distribution. The full text of the license may be found at +# http://opensource.org/licenses/bsd-license.php +# +# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +# +# + +#include <AsmMacroIoLibV8.h> +#include <Base.h> +#include <Library/ArmLib.h> +#include <Library/PcdLib.h> +#include <AutoGen.h> + +.text +.align 2 + +GCC_ASM_EXPORT(ArmPlatformPeiBootAction) +GCC_ASM_EXPORT(ArmPlatformIsPrimaryCore) +GCC_ASM_EXPORT(ArmPlatformGetPrimaryCoreMpId) +GCC_ASM_EXPORT(ArmPlatformGetCorePosition) +GCC_ASM_EXPORT(ArmGetPhysAddrTop) + +GCC_ASM_IMPORT(_gPcd_FixedAtBuild_PcdArmPrimaryCore) +GCC_ASM_IMPORT(_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask) +GCC_ASM_IMPORT(_gPcd_FixedAtBuild_PcdCoreCount) + +.LFdtMagic: + .byte 0xd0, 0x0d, 0xfe, 0xed + +.LArm64LinuxMagic: + .byte 0x41, 0x52, 0x4d, 0x64 + +ASM_PFX(ArmPlatformPeiBootAction): + mov x29, x30 // preserve LR + + // + // If we are booting from RAM using the Linux kernel boot protocol, x0 will + // point to the DTB image in memory. Otherwise, we are just coming out of + // reset, and x0 will be 0. Check also the FDT magic. + // + cbz x0, .Lout + ldr w8, .LFdtMagic + ldr w9, [x0] + cmp w8, w9 + bne .Lout + + // + // The base of the runtime image has been preserved in x1. Check whether + // the expected magic number can be found in the header. + // + ldr w8, .LArm64LinuxMagic + ldr w9, [x1, #0x38] + cmp w8, w9 + bne .Lout + + // + // + // OK, so far so good. We have confirmed that we likely have a DTB and are + // booting via the arm64 Linux boot protocol. Update the base-of-image PCD + // to the actual relocated value, and add the shift of PcdFdBaseAddress to + // PcdFvBaseAddress as well + // + adr x8, PcdGet64 (PcdFdBaseAddress) + adr x9, PcdGet64 (PcdFvBaseAddress) + ldr x6, [x8] + ldr x7, [x9] + sub x7, x7, x6 + add x7, x7, x1 + str x1, [x8] + str x7, [x9] + + // + // Copy the DTB to the slack space right after the header at the base of this + // image, and record the pointer in PcdDeviceTreeInitialBaseAddress. + // + adr x8, PcdGet64 (PcdDeviceTreeInitialBaseAddress) + add x1, x1, #0x40 + str x1, [x8] + + ldr w8, [x0, #4] // get DTB size (BE) + mov x9, x1 + rev w8, w8 + add x8, x8, x0 +0:ldp x6, x7, [x0], #16 + stp x6, x7, [x9], #16 + cmp x0, x8 + blt 0b + + // + // Discover the memory size and offset from the DTB, and record in the + // respective PCDs + // + mov x0, x1 + bl find_memnode // returns (size, base) size in (x0, x1) + cbz x0, .Lout + + adr x8, PcdGet64 (PcdSystemMemorySize) + adr x9, PcdGet64 (PcdSystemMemoryBase) + str x0, [x8] + str x1, [x9] + +.Lout: + ret x29 + +//UINTN +//ArmPlatformGetPrimaryCoreMpId ( +// VOID +// ); +ASM_PFX(ArmPlatformGetPrimaryCoreMpId): + LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCore, x0) + ldrh w0, [x0] + ret + +//UINTN +//ArmPlatformIsPrimaryCore ( +// IN UINTN MpId +// ); +ASM_PFX(ArmPlatformIsPrimaryCore): + mov x0, #1 + ret + +//UINTN +//ArmPlatformGetCorePosition ( +// IN UINTN MpId +// ); +// With this function: CorePos = (ClusterId * 4) + CoreId +ASM_PFX(ArmPlatformGetCorePosition): + and x1, x0, #ARM_CORE_MASK + and x0, x0, #ARM_CLUSTER_MASK + add x0, x1, x0, LSR #6 + ret + +//EFI_PHYSICAL_ADDRESS +//GetPhysAddrTop ( +// VOID +// ); +ASM_PFX(ArmGetPhysAddrTop): + mrs x0, id_aa64mmfr0_el1 + adr x1, .LPARanges + and x0, x0, #7 + ldrb w1, [x1, x0] + mov x0, #1 + lsl x0, x0, x1 + ret + +// +// Bits 0..2 of the AA64MFR0_EL1 system register encode the size of the +// physical address space support on this CPU: +// 0 == 32 bits, 1 == 36 bits, etc etc +// 6 and 7 are reserved +// +.LPARanges: + .byte 32, 36, 40, 42, 44, 48, -1, -1 + +ASM_FUNCTION_REMOVE_IF_UNREFERENCED diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/ArmXenRelocatablePlatformLib.inf b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/ArmXenRelocatablePlatformLib.inf new file mode 100644 index 000000000000..17bb0f9292e2 --- /dev/null +++ b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/ArmXenRelocatablePlatformLib.inf @@ -0,0 +1,59 @@ +#/* @file +# Copyright (c) 2011-2014, ARM Limited. All rights reserved. +# Copyright (c) 2014, Linaro Limited. All rights reserved. +# +# This program and the accompanying materials +# are licensed and made available under the terms and conditions of the BSD License +# which accompanies this distribution. The full text of the license may be found at +# http://opensource.org/licenses/bsd-license.php +# +# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +# +#*/ + +[Defines] + INF_VERSION = 0x00010005 + BASE_NAME = ArmXenRelocatablePlatformLib + FILE_GUID = c8602718-4faa-4119-90ca-cae72509ac4c + MODULE_TYPE = BASE + VERSION_STRING = 1.0 + LIBRARY_CLASS = ArmPlatformLib|SEC PEIM + +[Packages] + MdePkg/MdePkg.dec + MdeModulePkg/MdeModulePkg.dec + EmbeddedPkg/EmbeddedPkg.dec + ArmPkg/ArmPkg.dec + ArmPlatformPkg/ArmPlatformPkg.dec + ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualizationPkg.dec + +[LibraryClasses] + IoLib + ArmLib + PrintLib + +[Sources.common] + RelocatableVirt.c + XenVirtMem.c + +[Sources.AARCH64] + AARCH64/RelocatableVirtHelper.S + AARCH64/MemnodeParser.S + +[FeaturePcd] + gEmbeddedTokenSpaceGuid.PcdCacheEnable + gArmPlatformTokenSpaceGuid.PcdSystemMemoryInitializeInSec + +[PatchPcd] + gArmVirtualizationTokenSpaceGuid.PcdDeviceTreeInitialBaseAddress + gArmTokenSpaceGuid.PcdFdBaseAddress + gArmTokenSpaceGuid.PcdFvBaseAddress + gArmTokenSpaceGuid.PcdSystemMemoryBase + gArmTokenSpaceGuid.PcdSystemMemorySize + +[FixedPcd] + gArmPlatformTokenSpaceGuid.PcdCoreCount + gArmTokenSpaceGuid.PcdArmPrimaryCoreMask + gArmTokenSpaceGuid.PcdArmPrimaryCore + gArmTokenSpaceGuid.PcdFdSize diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/RelocatableVirt.c b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/RelocatableVirt.c new file mode 100644 index 000000000000..c10c09fed2bd --- /dev/null +++ b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/RelocatableVirt.c @@ -0,0 +1,71 @@ +/** @file +* +* Copyright (c) 2011-2013, ARM Limited. All rights reserved. +* Copyright (c) 2014, Linaro Limited. All rights reserved. +* Copyright (c) 2014, Red Hat, Inc. +* +* +* This program and the accompanying materials +* are licensed and made available under the terms and conditions of the BSD License +* which accompanies this distribution. The full text of the license may be found at +* http://opensource.org/licenses/bsd-license.php +* +* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +* +**/ + +#include <Library/IoLib.h> +#include <Library/ArmPlatformLib.h> +#include <Library/DebugLib.h> +#include <ArmPlatform.h> +#include <Pi/PiBootMode.h> + +/** + Return the current Boot Mode + + This function returns the boot reason on the platform + + @return Return the current Boot Mode of the platform + +**/ +EFI_BOOT_MODE +ArmPlatformGetBootMode ( + VOID + ) +{ + return BOOT_WITH_FULL_CONFIGURATION; +} + +/** + This function is called by PrePeiCore, in the SEC phase. +**/ +RETURN_STATUS +ArmPlatformInitialize ( + IN UINTN MpId + ) +{ + // + // We are relying on ArmPlatformInitializeSystemMemory () being called from + // InitializeMemory (), which only occurs if the following feature is disabled + // + ASSERT (!FeaturePcdGet (PcdSystemMemoryInitializeInSec)); + return RETURN_SUCCESS; +} + +VOID +ArmPlatformInitializeSystemMemory ( + VOID + ) +{ +} + +VOID +ArmPlatformGetPlatformPpiList ( + OUT UINTN *PpiListSize, + OUT EFI_PEI_PPI_DESCRIPTOR **PpiList + ) +{ + *PpiListSize = 0; + *PpiList = NULL; +} diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/XenVirtMem.c b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/XenVirtMem.c new file mode 100644 index 000000000000..657b840059c2 --- /dev/null +++ b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmXenRelocatablePlatformLib/XenVirtMem.c @@ -0,0 +1,83 @@ +/** @file +* +* Copyright (c) 2014, Linaro Limited. All rights reserved. +* +* This program and the accompanying materials +* are licensed and made available under the terms and conditions of the BSD License +* which accompanies this distribution. The full text of the license may be found at +* http://opensource.org/licenses/bsd-license.php +* +* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +* +**/ + +#include <Library/ArmPlatformLib.h> +#include <Library/DebugLib.h> +#include <Library/BaseMemoryLib.h> +#include <Library/PcdLib.h> +#include <Library/IoLib.h> +#include <Library/MemoryAllocationLib.h> +#include <ArmPlatform.h> + +// Number of Virtual Memory Map Descriptors +#define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS 2 + +// DDR attributes +#define DDR_ATTRIBUTES_CACHED ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK +#define DDR_ATTRIBUTES_UNCACHED ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED + +EFI_PHYSICAL_ADDRESS +ArmGetPhysAddrTop ( + VOID + ); + +/** + Return the Virtual Memory Map of your platform + + This Virtual Memory Map is used by MemoryInitPei Module to initialize the MMU + on your platform. + + @param[out] VirtualMemoryMap Array of ARM_MEMORY_REGION_DESCRIPTOR + describing a Physical-to-Virtual Memory + mapping. This array must be ended by a + zero-filled entry + +**/ +VOID +ArmPlatformGetVirtualMemoryMap ( + IN ARM_MEMORY_REGION_DESCRIPTOR** VirtualMemoryMap + ) +{ + ARM_MEMORY_REGION_DESCRIPTOR *VirtualMemoryTable; + + ASSERT (VirtualMemoryMap != NULL); + + VirtualMemoryTable = AllocatePages ( + EFI_SIZE_TO_PAGES ( + sizeof (ARM_MEMORY_REGION_DESCRIPTOR) + * MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS + ) + ); + + if (VirtualMemoryTable == NULL) { + DEBUG ((EFI_D_ERROR, "%a: Error: Failed AllocatePages()\n", __FUNCTION__)); + return; + } + + // + // Map the entire physical memory space as cached. The only device + // we care about is the GIC, which will be stage 2 mapped as a device + // by the hypervisor, which will override the cached mapping we install + // here. + // + VirtualMemoryTable[0].PhysicalBase = 0x0; + VirtualMemoryTable[0].VirtualBase = 0x0; + VirtualMemoryTable[0].Length = ArmGetPhysAddrTop (); + VirtualMemoryTable[0].Attributes = DDR_ATTRIBUTES_CACHED; + + // End of Table + ZeroMem (&VirtualMemoryTable[1], sizeof (ARM_MEMORY_REGION_DESCRIPTOR)); + + *VirtualMemoryMap = VirtualMemoryTable; +} -- 1.8.3.2 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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