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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: edk2-devel@lists.01.org
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Laszlo Ersek <lersek@redhat.com>,
	Leif Lindholm <leif.lindholm@linaro.org>,
	Eric Auger <eric.auger@redhat.com>,
	Andrew Jones <drjones@redhat.com>,
	Philippe Mathieu-Daude <philmd@redhat.com>,
	Julien Grall <julien.grall@linaro.org>
Subject: [PATCH v3 06/16] ArmPkg/ArmLib: add support for reading the max physical address space size
Date: Wed, 28 Nov 2018 15:33:47 +0100	[thread overview]
Message-ID: <20181128143357.991-7-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <20181128143357.991-1-ard.biesheuvel@linaro.org>

Add a helper function that returns the maximum physical address space
size as supported by the current CPU.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 ArmPkg/Include/Library/ArmLib.h               |  6 ++++++
 ArmPkg/Library/ArmLib/AArch64/ArmLibSupport.S | 17 +++++++++++++++++
 ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S     |  8 ++++++++
 ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm   |  8 ++++++++
 4 files changed, 39 insertions(+)

diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index ffda50e9d767..9a804c15fdb6 100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -733,4 +733,10 @@ ArmWriteCntvOff (
   UINT64   Val
   );
 
+UINTN
+EFIAPI
+ArmGetPhysicalAddressBits (
+  VOID
+  );
+
 #endif // __ARM_LIB__
diff --git a/ArmPkg/Library/ArmLib/AArch64/ArmLibSupport.S b/ArmPkg/Library/ArmLib/AArch64/ArmLibSupport.S
index 1ef2f61f5979..b7173e00b039 100644
--- a/ArmPkg/Library/ArmLib/AArch64/ArmLibSupport.S
+++ b/ArmPkg/Library/ArmLib/AArch64/ArmLibSupport.S
@@ -196,4 +196,21 @@ ASM_FUNC(ArmWriteSctlr)
 3:msr   sctlr_el3, x0
 4:ret
 
+ASM_FUNC(ArmGetPhysicalAddressBits)
+  mrs   x0, id_aa64mmfr0_el1
+  adr   x1, .LPARanges
+  and   x0, x0, #0xf
+  ldrb  w0, [x1, x0]
+  ret
+
+//
+// Bits 0..3 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
+// 7 and up are reserved
+//
+.LPARanges:
+  .byte 32, 36, 40, 42, 44, 48, 52,  0
+  .byte  0,  0,  0,  0,  0,  0,  0,  0
+
 ASM_FUNCTION_REMOVE_IF_UNREFERENCED
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S
index f2a517671f0a..0e9f9d0453e4 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S
@@ -165,4 +165,12 @@ ASM_FUNC(ArmWriteCpuActlr)
   isb
   bx      lr
 
+ASM_FUNC (ArmGetPhysicalAddressBits)
+  mrc     p15, 0, r0, c0, c1, 4   // MMFR0
+  and     r0, r0, #0xf            // VMSA [3:0]
+  cmp     r0, #5                  // >= 5 implies LPAE support
+  movlt   r0, #32                 // 32 bits if no LPAE
+  movge   r0, #40                 // 40 bits if LPAE
+  bx      lr
+
 ASM_FUNCTION_REMOVE_IF_UNREFERENCED
diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm
index 219140c22b13..3eb52875971d 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm
@@ -169,4 +169,12 @@
   isb
   bx      lr
 
+ RVCT_ASM_EXPORT ArmGetPhysicalAddressBits
+  mrc     p15, 0, r0, c0, c1, 4   ; MMFR0
+  and     r0, r0, #0xf            ; VMSA [3:0]
+  cmp     r0, #5                  ; >= 5 implies LPAE support
+  movlt   r0, #32                 ; 32 bits if no LPAE
+  movge   r0, #40                 ; 40 bits if LPAE
+  bx      lr
+
   END
-- 
2.19.1



  parent reply	other threads:[~2018-11-28 14:34 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-28 14:33 [PATCH v3 00/16] [Arm|ArmVirt|MdePkg|Embedded]Pkg: lift 40-bit IPA space limit Ard Biesheuvel
2018-11-28 14:33 ` [PATCH v3 01/16] EmbeddedPkg/TemplateSec: remove unused module Ard Biesheuvel
2018-11-28 17:55   ` Laszlo Ersek
2018-11-29 15:39   ` Leif Lindholm
2018-11-28 14:33 ` [PATCH v3 02/16] EmbeddedPkg/PrePiHobLib: drop CreateHobList() from library Ard Biesheuvel
2018-11-28 17:58   ` Laszlo Ersek
2018-11-29 15:40   ` Leif Lindholm
2018-11-28 14:33 ` [PATCH v3 03/16] ArmVirtPkg/FdtPciHostBridgeLib: map ECAM and I/O spaces in GCD memory map Ard Biesheuvel
2018-11-28 18:00   ` Laszlo Ersek
2018-11-28 14:33 ` [PATCH v3 04/16] ArmVirtPkg/QemuVirtMemInfoLib: remove 1:1 mapping of top of PA range Ard Biesheuvel
2018-11-28 15:06   ` Philippe Mathieu-Daudé
2018-11-28 18:05   ` Laszlo Ersek
2018-11-28 14:33 ` [PATCH v3 05/16] MdePkg/ProcessorBind.h AARCH64: limit MAX_ADDRESS to 48 bits Ard Biesheuvel
2018-11-28 18:41   ` Laszlo Ersek
2018-11-29 10:40     ` Ard Biesheuvel
2018-11-29 11:34       ` Laszlo Ersek
2018-11-29 15:19         ` Gao, Liming
2018-11-28 14:33 ` Ard Biesheuvel [this message]
2018-11-28 14:41   ` [PATCH v3 06/16] ArmPkg/ArmLib: add support for reading the max physical address space size Philippe Mathieu-Daudé
2018-11-28 18:44   ` Laszlo Ersek
2018-11-29 15:42   ` Leif Lindholm
2018-11-28 14:33 ` [PATCH v3 07/16] ArmVirtPkg/XenVirtMemInfoLib: refactor reading of the PA " Ard Biesheuvel
2018-11-28 14:44   ` Philippe Mathieu-Daudé
2018-11-28 18:47   ` Laszlo Ersek
2018-11-28 14:33 ` [PATCH v3 08/16] ArmPkg/ArmMmuLib: take the CPU supported maximum PA space into account Ard Biesheuvel
2018-11-28 14:46   ` Philippe Mathieu-Daudé
2018-11-28 19:26   ` Laszlo Ersek
2018-11-29 15:43   ` Leif Lindholm
2018-11-28 14:33 ` [PATCH v3 09/16] ArmPkg/CpuPei: base GCD memory space size on CPU's PA range Ard Biesheuvel
2018-11-28 15:01   ` Philippe Mathieu-Daudé
2018-11-28 19:51   ` Laszlo Ersek
2018-11-29 15:43   ` Leif Lindholm
2018-11-28 14:33 ` [PATCH v3 10/16] ArmPlatformPkg/PrePi: " Ard Biesheuvel
2018-11-28 15:01   ` Philippe Mathieu-Daudé
2018-11-28 19:53   ` Laszlo Ersek
2018-11-29 15:44   ` Leif Lindholm
2018-11-28 14:33 ` [PATCH v3 11/16] ArmVirtPkg/PrePi: " Ard Biesheuvel
2018-11-28 15:02   ` Philippe Mathieu-Daudé
2018-11-28 19:52   ` Laszlo Ersek
2018-11-28 14:33 ` [PATCH v3 12/16] BeagleBoardPkg/PrePi: " Ard Biesheuvel
2018-11-28 15:02   ` Philippe Mathieu-Daudé
2018-11-28 19:53   ` Laszlo Ersek
2018-11-29 15:44   ` Leif Lindholm
2018-11-28 14:33 ` [PATCH v3 13/16] ArmPlatformPkg/PlatformPei: drop unused PCD references Ard Biesheuvel
2018-11-28 19:54   ` Laszlo Ersek
2018-11-29 15:45   ` Leif Lindholm
2018-11-28 14:33 ` [PATCH v3 14/16] EmbeddedPkg/PrePiLib: drop unused PCD reference Ard Biesheuvel
2018-11-28 19:55   ` Laszlo Ersek
2018-11-29 15:46   ` Leif Lindholm
2018-11-28 14:33 ` [PATCH v3 15/16] ArmVirtPkg: drop PcdPrePiCpuMemorySize assignments from all platforms Ard Biesheuvel
2018-11-28 19:56   ` Laszlo Ersek
2018-11-28 14:33 ` [PATCH v3 16/16] EmbeddedPkg/EmbeddedPkg.dec: drop PcdPrePiCpuMemorySize declarations Ard Biesheuvel
2018-11-28 19:57   ` Laszlo Ersek
2018-11-29 15:46   ` Leif Lindholm
2018-11-29 17:59 ` [PATCH v3 00/16] [Arm|ArmVirt|MdePkg|Embedded]Pkg: lift 40-bit IPA space limit Ard Biesheuvel
2018-11-30 21:45   ` Ard Biesheuvel

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