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arm64: sysreg: Move to use definitions for all the SCTLR bits
__cpu_setup() configures SCTLR_EL1 using some hard coded hex masks,
and el2_setup() duplicates some this when setting RES1 bits.
Lets make this the same as KVM's hyp_init, which uses named bits.
First, we add definitions for all the SCTLR_EL{1,2} bits, the RES{1,0}
bits, and those we want to set or clear.
Add a build_bug checks to ensures all bits are either set or clear.
This means we don't need to preserve endian-ness configuration
generated elsewhere.
Finally, move the head.S and proc.S users of these hard-coded masks
over to the macro versions.
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
James Morse
Catalin Marinas
parent
edf298cfce
commit
7a00d68ebe
@ -20,6 +20,7 @@
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#ifndef __ASM_SYSREG_H
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#define __ASM_SYSREG_H
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#include <asm/compiler.h>
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#include <linux/stringify.h>
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/*
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@ -398,25 +399,81 @@
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/* Common SCTLR_ELx flags. */
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#define SCTLR_ELx_EE (1 << 25)
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#define SCTLR_ELx_WXN (1 << 19)
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#define SCTLR_ELx_I (1 << 12)
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#define SCTLR_ELx_SA (1 << 3)
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#define SCTLR_ELx_C (1 << 2)
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#define SCTLR_ELx_A (1 << 1)
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#define SCTLR_ELx_M 1
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#define SCTLR_EL2_RES1 ((1 << 4) | (1 << 5) | (1 << 11) | (1 << 16) | \
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(1 << 18) | (1 << 22) | (1 << 23) | (1 << 28) | \
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(1 << 29))
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#define SCTLR_ELx_FLAGS (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | \
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SCTLR_ELx_SA | SCTLR_ELx_I)
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/* SCTLR_EL2 specific flags. */
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#define SCTLR_EL2_RES1 ((1 << 4) | (1 << 5) | (1 << 11) | (1 << 16) | \
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(1 << 18) | (1 << 22) | (1 << 23) | (1 << 28) | \
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(1 << 29))
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#define SCTLR_EL2_RES0 ((1 << 6) | (1 << 7) | (1 << 8) | (1 << 9) | \
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(1 << 10) | (1 << 13) | (1 << 14) | (1 << 15) | \
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(1 << 17) | (1 << 20) | (1 << 21) | (1 << 24) | \
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(1 << 26) | (1 << 27) | (1 << 30) | (1 << 31))
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define ENDIAN_SET_EL2 SCTLR_ELx_EE
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#define ENDIAN_CLEAR_EL2 0
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#else
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#define ENDIAN_SET_EL2 0
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#define ENDIAN_CLEAR_EL2 SCTLR_ELx_EE
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#endif
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/* SCTLR_EL2 value used for the hyp-stub */
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#define SCTLR_EL2_SET (ENDIAN_SET_EL2 | SCTLR_EL2_RES1)
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#define SCTLR_EL2_CLEAR (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | \
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SCTLR_ELx_SA | SCTLR_ELx_I | SCTLR_ELx_WXN | \
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ENDIAN_CLEAR_EL2 | SCTLR_EL2_RES0)
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/* Check all the bits are accounted for */
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#define SCTLR_EL2_BUILD_BUG_ON_MISSING_BITS BUILD_BUG_ON((SCTLR_EL2_SET ^ SCTLR_EL2_CLEAR) != ~0)
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/* SCTLR_EL1 specific flags. */
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#define SCTLR_EL1_UCI (1 << 26)
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#define SCTLR_EL1_E0E (1 << 24)
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#define SCTLR_EL1_SPAN (1 << 23)
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#define SCTLR_EL1_NTWE (1 << 18)
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#define SCTLR_EL1_NTWI (1 << 16)
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#define SCTLR_EL1_UCT (1 << 15)
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#define SCTLR_EL1_DZE (1 << 14)
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#define SCTLR_EL1_UMA (1 << 9)
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#define SCTLR_EL1_SED (1 << 8)
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#define SCTLR_EL1_ITD (1 << 7)
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#define SCTLR_EL1_CP15BEN (1 << 5)
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#define SCTLR_EL1_SA0 (1 << 4)
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#define SCTLR_EL1_RES1 ((1 << 11) | (1 << 20) | (1 << 22) | (1 << 28) | \
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(1 << 29))
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#define SCTLR_EL1_RES0 ((1 << 6) | (1 << 10) | (1 << 13) | (1 << 17) | \
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(1 << 21) | (1 << 27) | (1 << 30) | (1 << 31))
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define ENDIAN_SET_EL1 (SCTLR_EL1_E0E | SCTLR_ELx_EE)
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#define ENDIAN_CLEAR_EL1 0
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#else
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#define ENDIAN_SET_EL1 0
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#define ENDIAN_CLEAR_EL1 (SCTLR_EL1_E0E | SCTLR_ELx_EE)
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#endif
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#define SCTLR_EL1_SET (SCTLR_ELx_M | SCTLR_ELx_C | SCTLR_ELx_SA |\
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SCTLR_EL1_SA0 | SCTLR_EL1_SED | SCTLR_ELx_I |\
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SCTLR_EL1_DZE | SCTLR_EL1_UCT | SCTLR_EL1_NTWI |\
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SCTLR_EL1_NTWE | SCTLR_EL1_SPAN | ENDIAN_SET_EL1 |\
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SCTLR_EL1_UCI | SCTLR_EL1_RES1)
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#define SCTLR_EL1_CLEAR (SCTLR_ELx_A | SCTLR_EL1_CP15BEN | SCTLR_EL1_ITD |\
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SCTLR_EL1_UMA | SCTLR_ELx_WXN | ENDIAN_CLEAR_EL1 |\
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SCTLR_EL1_RES0)
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/* Check all the bits are accounted for */
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#define SCTLR_EL1_BUILD_BUG_ON_MISSING_BITS BUILD_BUG_ON((SCTLR_EL1_SET ^ SCTLR_EL1_CLEAR) != ~0)
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/* id_aa64isar0 */
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#define ID_AA64ISAR0_FHM_SHIFT 48
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@ -593,6 +650,7 @@
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#else
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#include <linux/build_bug.h>
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#include <linux/types.h>
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asm(
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@ -649,6 +707,9 @@ static inline void config_sctlr_el1(u32 clear, u32 set)
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{
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u32 val;
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SCTLR_EL2_BUILD_BUG_ON_MISSING_BITS;
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SCTLR_EL1_BUILD_BUG_ON_MISSING_BITS;
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val = read_sysreg(sctlr_el1);
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val &= ~clear;
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val |= set;
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@ -492,17 +492,13 @@ ENTRY(el2_setup)
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mrs x0, CurrentEL
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cmp x0, #CurrentEL_EL2
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b.eq 1f
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mrs x0, sctlr_el1
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CPU_BE( orr x0, x0, #(3 << 24) ) // Set the EE and E0E bits for EL1
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CPU_LE( bic x0, x0, #(3 << 24) ) // Clear the EE and E0E bits for EL1
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mov_q x0, (SCTLR_EL1_RES1 | ENDIAN_SET_EL1)
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msr sctlr_el1, x0
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mov w0, #BOOT_CPU_MODE_EL1 // This cpu booted in EL1
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isb
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ret
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1: mrs x0, sctlr_el2
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CPU_BE( orr x0, x0, #(1 << 25) ) // Set the EE bit for EL2
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CPU_LE( bic x0, x0, #(1 << 25) ) // Clear the EE bit for EL2
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1: mov_q x0, (SCTLR_EL2_RES1 | ENDIAN_SET_EL2)
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msr sctlr_el2, x0
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#ifdef CONFIG_ARM64_VHE
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@ -618,10 +614,7 @@ install_el2_stub:
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* requires no configuration, and all non-hyp-specific EL2 setup
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* will be done via the _EL1 system register aliases in __cpu_setup.
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*/
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/* sctlr_el1 */
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mov x0, #0x0800 // Set/clear RES{1,0} bits
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CPU_BE( movk x0, #0x33d0, lsl #16 ) // Set EE and E0E on BE systems
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CPU_LE( movk x0, #0x30d0, lsl #16 ) // Clear EE and E0E on LE systems
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mov_q x0, (SCTLR_EL1_RES1 | ENDIAN_SET_EL1)
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msr sctlr_el1, x0
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/* Coprocessor traps. */
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@ -226,11 +226,7 @@ ENTRY(__cpu_setup)
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/*
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* Prepare SCTLR
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*/
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adr x5, crval
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ldp w5, w6, [x5]
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mrs x0, sctlr_el1
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bic x0, x0, x5 // clear bits
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orr x0, x0, x6 // set bits
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mov_q x0, SCTLR_EL1_SET
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/*
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* Set/prepare TCR and TTBR. We use 512GB (39-bit) address range for
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* both user and kernel.
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@ -259,21 +255,3 @@ ENTRY(__cpu_setup)
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msr tcr_el1, x10
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ret // return to head.S
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ENDPROC(__cpu_setup)
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/*
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* We set the desired value explicitly, including those of the
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* reserved bits. The values of bits EE & E0E were set early in
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* el2_setup, which are left untouched below.
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*
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* n n T
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* U E WT T UD US IHBS
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* CE0 XWHW CZ ME TEEA S
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* .... .IEE .... NEAI TE.I ..AD DEN0 ACAM
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* 0011 0... 1101 ..0. ..0. 10.. .0.. .... < hardware reserved
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* .... .1.. .... 01.1 11.1 ..01 0.01 1101 < software settings
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*/
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.type crval, #object
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crval:
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.word 0xfcffffff // clear
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.word 0x34d5d91d // set
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.popsection
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