[Xen-devel] [RFC PATCH v3 01/10] arm/mem_access: Add (TCR_|TTBCR_)* defines

[Sergej Proskurin <proskurin@xxxxxxxxxxxxx>]

This commit adds (TCR_|TTBCR_)* defines to simplify access to the
respective register contents. At the same time, we adjust the macro
TCR_T0SZ by using the newly introduced TCR_T0SZ_SHIFT instead of the
hardcoded value.

Signed-off-by: Sergej Proskurin <proskurin@xxxxxxxxxxxxx>
---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
---
v2: Define TCR_SZ_MASK in a way so that it can be also applied to 32-bit guests
    using the long-descriptor translation table format.

    Extend the previous commit by further defines allowing a simplified access
    to the registers TCR_EL1 and TTBCR.

v3: Replace the hardcoded value 0 in the TCR_T0SZ macro with the newly
    introduced TCR_T0SZ_SHIFT. Also, replace the hardcoded value 14 in
    the TCR_TG0_* macros with the introduced TCR_TG0_SHIFT.

    Comment when to apply the defines TTBCR_PD(0|1), according to ARM
    DDI 0487B-a and ARM DDI 0406C-b.

    Remove TCR_TB_* defines.

    Comment when certain TCR_EL2 register fields can be applied.
---
 xen/include/asm-arm/processor.h | 69 ++++++++++++++++++++++++++++++++++++++---
 1 file changed, 65 insertions(+), 4 deletions(-)

diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
index 855ded1b07..13f172a20f 100644
--- a/xen/include/asm-arm/processor.h
+++ b/xen/include/asm-arm/processor.h
@@ -94,6 +94,13 @@
 #define TTBCR_N_2KB  _AC(0x03,U)
 #define TTBCR_N_1KB  _AC(0x04,U)
 
+/*
+ * TTBCR_PD(0|1) can be applied only if LPAE is disabled, i.e., TTBCR.EAE==0
+ * (ARM DDI 0487B-a G6-5203 and ARM DDI 0406C-b B4-1722).
+ */
+#define TTBCR_PD0       (_AC(1,U)<<4)
+#define TTBCR_PD1       (_AC(1,U)<<5)
+
 /* SCTLR System Control Register. */
 /* HSCTLR is a subset of this. */
 #define SCTLR_TE        (_AC(1,U)<<30)
@@ -154,7 +161,20 @@
 
 /* TCR: Stage 1 Translation Control */
 
-#define TCR_T0SZ(x)     ((x)<<0)
+#define TCR_T0SZ_SHIFT  (0)
+#define TCR_T1SZ_SHIFT  (16)
+#define TCR_T0SZ(x)     ((x)<<TCR_T0SZ_SHIFT)
+
+/*
+ * According to ARM DDI 0487B-a, TCR_EL1.{T0SZ,T1SZ} (AArch64, Section D7-2480)
+ * comprises 6 bits and TTBCR.{T0SZ,T1SZ} (AArch32, Section G6-5204) comprises
+ * 3 bits following another 3 bits for RES0. Thus, the mask for both registers
+ * should be 0x3f.
+ */
+#define TCR_SZ_MASK     (_AC(0x3f,UL)<<0)
+
+#define TCR_EPD0        (_AC(0x1,UL)<<7)
+#define TCR_EPD1        (_AC(0x1,UL)<<23)
 
 #define TCR_IRGN0_NC    (_AC(0x0,UL)<<8)
 #define TCR_IRGN0_WBWA  (_AC(0x1,UL)<<8)
@@ -170,15 +190,56 @@
 #define TCR_SH0_OS      (_AC(0x2,UL)<<12)
 #define TCR_SH0_IS      (_AC(0x3,UL)<<12)
 
-#define TCR_TG0_4K      (_AC(0x0,UL)<<14)
-#define TCR_TG0_64K     (_AC(0x1,UL)<<14)
-#define TCR_TG0_16K     (_AC(0x2,UL)<<14)
+/* Note that the fields TCR_EL1.{TG0,TG1} are not available on AArch32. */
+#define TCR_TG0_SHIFT   (14)
+#define TCR_TG0_MASK    (_AC(0x3,UL)<<TCR_TG0_SHIFT)
+#define TCR_TG0_4K      (_AC(0x0,UL)<<TCR_TG0_SHIFT)
+#define TCR_TG0_64K     (_AC(0x1,UL)<<TCR_TG0_SHIFT)
+#define TCR_TG0_16K     (_AC(0x2,UL)<<TCR_TG0_SHIFT)
+
+/* Note that the field TCR_EL2.TG1 exists only if HCR_EL2.E2H==1. */
+#define TCR_EL1_TG1_SHIFT   (30)
+#define TCR_EL1_TG1_MASK    (_AC(0x3,UL)<<TCR_EL1_TG1_SHIFT)
+#define TCR_EL1_TG1_16K     (_AC(0x1,UL)<<TCR_EL1_TG1_SHIFT)
+#define TCR_EL1_TG1_4K      (_AC(0x2,UL)<<TCR_EL1_TG1_SHIFT)
+#define TCR_EL1_TG1_64K     (_AC(0x3,UL)<<TCR_EL1_TG1_SHIFT)
+
+/*
+ * Note that the field TCR_EL1.IPS is not available on AArch32. Also, the field
+ * TCR_EL2.IPS exists only if HCR_EL2.E2H==1.
+ */
+#define TCR_EL1_IPS_SHIFT   (32)
+#define TCR_EL1_IPS_MASK    (_AC(0x7,ULL)<<TCR_EL1_IPS_SHIFT)
+#define TCR_EL1_IPS_32_BIT  (_AC(0x0,ULL)<<TCR_EL1_IPS_SHIFT)
+#define TCR_EL1_IPS_36_BIT  (_AC(0x1,ULL)<<TCR_EL1_IPS_SHIFT)
+#define TCR_EL1_IPS_40_BIT  (_AC(0x2,ULL)<<TCR_EL1_IPS_SHIFT)
+#define TCR_EL1_IPS_42_BIT  (_AC(0x3,ULL)<<TCR_EL1_IPS_SHIFT)
+#define TCR_EL1_IPS_44_BIT  (_AC(0x4,ULL)<<TCR_EL1_IPS_SHIFT)
+#define TCR_EL1_IPS_48_BIT  (_AC(0x5,ULL)<<TCR_EL1_IPS_SHIFT)
+#define TCR_EL1_IPS_52_BIT  (_AC(0x6,ULL)<<TCR_EL1_IPS_SHIFT)
+
+/*
+ * The following values correspond to the bit masks represented by
+ * TCR_EL1_IPS_XX_BIT defines.
+ */
+#define TCR_EL1_IPS_32_BIT_VAL  (32)
+#define TCR_EL1_IPS_36_BIT_VAL  (36)
+#define TCR_EL1_IPS_40_BIT_VAL  (40)
+#define TCR_EL1_IPS_42_BIT_VAL  (42)
+#define TCR_EL1_IPS_44_BIT_VAL  (44)
+#define TCR_EL1_IPS_48_BIT_VAL  (48)
+#define TCR_EL1_IPS_52_BIT_VAL  (52)
+#define TCR_EL1_IPS_MIN_VAL     (25)
 
 #ifdef CONFIG_ARM_64
 
 #define TCR_PS(x)       ((x)<<16)
 #define TCR_TBI         (_AC(0x1,UL)<<20)
 
+/* Note that the fields TCR_EL2.TBI(0|1) exist only if HCR_EL2.E2H==1. */
+#define TCR_EL1_TBI0    (_AC(0x1,UL)<<37)
+#define TCR_EL1_TBI1    (_AC(0x1,UL)<<38)
+
 #define TCR_RES1        (_AC(1,UL)<<31|_AC(1,UL)<<23)
 
 #else
-- 
2.12.2


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