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xen/arm: Move some of the functions to common file
regions.inc is added to hold the common earlyboot MPU regions configurations between arm64 and arm32. prepare_xen_region, fail_insufficient_regions() will be used by both arm32 and arm64. Thus, they have been moved to regions.inc. *_PRBAR are moved to arm64/sysregs.h. *_PRLAR are moved to regions.inc as they are common between arm32 and arm64. Introduce WRITE_SYSREG_ASM to write to the system registers from regions.inc. Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@amd.com> Reviewed-by: Luca Fancellu <luca.fancellu@arm.com> Reviewed-by: Michal Orzel <michal.orzel@amd.com> Tested-by: Luca Fancellu <luca.fancellu@arm.com>
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Ayan Kumar Halder authored and Michal Orzel committed
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@@ -3,83 +3,7 @@
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* Start-of-day code for an Armv8-R MPU system.
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*/
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#include <asm/early_printk.h>
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#include <asm/mpu.h>
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/* Backgroud region enable/disable */
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#define SCTLR_ELx_BR BIT(17, UL)
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#define REGION_TEXT_PRBAR 0x38 /* SH=11 AP=10 XN=00 */
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#define REGION_RO_PRBAR 0x3A /* SH=11 AP=10 XN=10 */
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#define REGION_DATA_PRBAR 0x32 /* SH=11 AP=00 XN=10 */
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#define REGION_DEVICE_PRBAR 0x22 /* SH=10 AP=00 XN=10 */
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#define REGION_NORMAL_PRLAR 0x0f /* NS=0 ATTR=111 EN=1 */
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#define REGION_DEVICE_PRLAR 0x09 /* NS=0 ATTR=100 EN=1 */
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/*
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* Macro to prepare and set a EL2 MPU memory region.
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* We will also create an according MPU memory region entry, which
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* is a structure of pr_t, in table \prmap.
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*
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* sel: region selector
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* base: reg storing base address
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* limit: reg storing limit address
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* prbar: store computed PRBAR_EL2 value
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* prlar: store computed PRLAR_EL2 value
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* maxcount: maximum number of EL2 regions supported
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* attr_prbar: PRBAR_EL2-related memory attributes. If not specified it will be
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* REGION_DATA_PRBAR
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* attr_prlar: PRLAR_EL2-related memory attributes. If not specified it will be
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* REGION_NORMAL_PRLAR
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*
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* Preserves \maxcount
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* Output:
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* \sel: Next available region selector index.
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* Clobbers \base, \limit, \prbar, \prlar
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*
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* Note that all parameters using registers should be distinct.
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*/
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.macro prepare_xen_region, sel, base, limit, prbar, prlar, maxcount, attr_prbar=REGION_DATA_PRBAR, attr_prlar=REGION_NORMAL_PRLAR
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/* Check if the region is empty */
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cmp \base, \limit
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beq 1f
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/* Check if the number of regions exceeded the count specified in MPUIR_EL2 */
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cmp \sel, \maxcount
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bge fail_insufficient_regions
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/* Prepare value for PRBAR_EL2 reg and preserve it in \prbar.*/
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and \base, \base, #MPU_REGION_MASK
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mov \prbar, #\attr_prbar
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orr \prbar, \prbar, \base
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/* Limit address should be inclusive */
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sub \limit, \limit, #1
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and \limit, \limit, #MPU_REGION_MASK
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mov \prlar, #\attr_prlar
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orr \prlar, \prlar, \limit
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msr PRSELR_EL2, \sel
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isb
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msr PRBAR_EL2, \prbar
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msr PRLAR_EL2, \prlar
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dsb sy
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isb
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add \sel, \sel, #1
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1:
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.endm
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/*
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* Failure caused due to insufficient MPU regions.
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*/
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FUNC_LOCAL(fail_insufficient_regions)
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PRINT("- Selected MPU region is above the implemented number in MPUIR_EL2 -\r\n")
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1: wfe
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b 1b
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END(fail_insufficient_regions)
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#include <asm/mpu/regions.inc>
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/*
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* Enable EL2 MPU and data cache
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@@ -462,6 +462,17 @@
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#define ZCR_ELx_LEN_SIZE 9
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#define ZCR_ELx_LEN_MASK 0x1ff
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#define REGION_TEXT_PRBAR 0x38 /* SH=11 AP=10 XN=00 */
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#define REGION_RO_PRBAR 0x3A /* SH=11 AP=10 XN=10 */
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#define REGION_DATA_PRBAR 0x32 /* SH=11 AP=00 XN=10 */
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#define REGION_DEVICE_PRBAR 0x22 /* SH=10 AP=00 XN=10 */
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#ifdef __ASSEMBLY__
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#define WRITE_SYSREG_ASM(v, name) "msr " __stringify(name,) #v
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#else /* __ASSEMBLY__ */
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/* Access to system registers */
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#define WRITE_SYSREG64(v, name) do { \
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@@ -481,6 +492,8 @@
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#define WRITE_SYSREG_LR(v, index) WRITE_SYSREG(v, ICH_LR_REG(index))
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#define READ_SYSREG_LR(index) READ_SYSREG(ICH_LR_REG(index))
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_ARM_ARM64_SYSREGS_H */
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/*
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@@ -0,0 +1,79 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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#include <asm/mpu.h>
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#include <asm/sysregs.h>
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/* Backgroud region enable/disable */
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#define SCTLR_ELx_BR BIT(17, UL)
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#define REGION_NORMAL_PRLAR 0x0f /* NS=0 ATTR=111 EN=1 */
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#define REGION_DEVICE_PRLAR 0x09 /* NS=0 ATTR=100 EN=1 */
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/*
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* Macro to prepare and set a EL2 MPU memory region.
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* We will also create an according MPU memory region entry, which
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* is a structure of pr_t, in table \prmap.
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*
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* sel: region selector
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* base: reg storing base address
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* limit: reg storing limit address
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* prbar: store computed PRBAR_EL2 value
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* prlar: store computed PRLAR_EL2 value
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* maxcount: maximum number of EL2 regions supported
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* attr_prbar: PRBAR_EL2-related memory attributes. If not specified it will be
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* REGION_DATA_PRBAR
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* attr_prlar: PRLAR_EL2-related memory attributes. If not specified it will be
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* REGION_NORMAL_PRLAR
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*
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* Preserves maxcount
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* Output:
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* sel: Next available region selector index.
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* Clobbers base, limit, prbar, prlar
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*
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* Note that all parameters using registers should be distinct.
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*/
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.macro prepare_xen_region, sel, base, limit, prbar, prlar, maxcount, attr_prbar=REGION_DATA_PRBAR, attr_prlar=REGION_NORMAL_PRLAR
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/* Check if the region is empty */
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cmp \base, \limit
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beq 1f
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/* Check if the number of regions exceeded the count specified in MPUIR_EL2 */
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cmp \sel, \maxcount
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bge fail_insufficient_regions
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/* Prepare value for PRBAR_EL2 reg and preserve it in \prbar.*/
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and \base, \base, #MPU_REGION_MASK
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mov \prbar, #\attr_prbar
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orr \prbar, \prbar, \base
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/* Limit address should be inclusive */
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sub \limit, \limit, #1
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and \limit, \limit, #MPU_REGION_MASK
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mov \prlar, #\attr_prlar
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orr \prlar, \prlar, \limit
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WRITE_SYSREG_ASM(\sel, PRSELR_EL2)
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isb
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WRITE_SYSREG_ASM(\prbar, PRBAR_EL2)
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WRITE_SYSREG_ASM(\prlar, PRLAR_EL2)
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dsb sy
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isb
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add \sel, \sel, #1
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1:
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.endm
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/* Failure caused due to insufficient MPU regions. */
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FUNC_LOCAL(fail_insufficient_regions)
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PRINT("- Selected MPU region is above the implemented number in MPUIR_EL2 -\r\n")
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1: wfe
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b 1b
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END(fail_insufficient_regions)
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/*
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* Local variables:
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* mode: ASM
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* indent-tabs-mode: nil
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* End:
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*/
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