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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] arm/mpu: Provide and populate MPU C data structures
commit 3c63d6b3304f4c01fc2e98009e1ef45cd7155453
Author: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
AuthorDate: Wed Jun 11 15:35:40 2025 +0100
Commit: Michal Orzel <michal.orzel@xxxxxxx>
CommitDate: Tue Jun 17 08:31:52 2025 +0200
arm/mpu: Provide and populate MPU C data structures
Modify Arm32 assembly boot code to reset any unused MPU region, initialise
'max_mpu_regions' with the number of supported MPU regions and set/clear the
bitmap 'xen_mpumap_mask' used to track the enabled regions.
Introduce cache.S to hold arm32 cache related functions.
Use the macro definition for "dcache_line_size" from linux.
Change the order of registers in prepare_xen_region() as 'strd' instruction
is used to store {prbar, prlar} in arm32. Thus, 'prbar' has to be a even
numbered register and 'prlar' is the consecutively ordered register.
Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
---
xen/arch/arm/arm32/Makefile | 1 +
xen/arch/arm/arm32/asm-offsets.c | 6 +++++
xen/arch/arm/arm32/cache.S | 43 ++++++++++++++++++++++++++++++++
xen/arch/arm/arm32/mpu/head.S | 41 ++++++++++++++++++++++++------
xen/arch/arm/include/asm/mpu/regions.inc | 2 +-
5 files changed, 84 insertions(+), 9 deletions(-)
diff --git a/xen/arch/arm/arm32/Makefile b/xen/arch/arm/arm32/Makefile
index 537969d753..531168f58a 100644
--- a/xen/arch/arm/arm32/Makefile
+++ b/xen/arch/arm/arm32/Makefile
@@ -2,6 +2,7 @@ obj-y += lib/
obj-$(CONFIG_MMU) += mmu/
obj-$(CONFIG_MPU) += mpu/
+obj-y += cache.o
obj-$(CONFIG_EARLY_PRINTK) += debug.o
obj-y += domctl.o
obj-y += domain.o
diff --git a/xen/arch/arm/arm32/asm-offsets.c b/xen/arch/arm/arm32/asm-offsets.c
index 8bbb0f938e..c203ce269d 100644
--- a/xen/arch/arm/arm32/asm-offsets.c
+++ b/xen/arch/arm/arm32/asm-offsets.c
@@ -75,6 +75,12 @@ void __dummy__(void)
OFFSET(INITINFO_stack, struct init_info, stack);
BLANK();
+
+#ifdef CONFIG_MPU
+ DEFINE(XEN_MPUMAP_MASK_sizeof, sizeof(xen_mpumap_mask));
+ DEFINE(XEN_MPUMAP_sizeof, sizeof(xen_mpumap));
+ BLANK();
+#endif
}
/*
diff --git a/xen/arch/arm/arm32/cache.S b/xen/arch/arm/arm32/cache.S
new file mode 100644
index 0000000000..b21bc66793
--- /dev/null
+++ b/xen/arch/arm/arm32/cache.S
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Cache maintenance */
+
+#include <asm/arm32/sysregs.h>
+
+/* dcache_line_size - get the minimum D-cache line size from the CTR register
*/
+ .macro dcache_line_size, reg, tmp
+ mrc CP32(\tmp, CTR) /* read ctr */
+ lsr \tmp, \tmp, #16
+ and \tmp, \tmp, #0xf /* cache line size encoding */
+ mov \reg, #4 /* bytes per word */
+ mov \reg, \reg, lsl \tmp /* actual cache line size */
+ .endm
+
+/*
+ * __invalidate_dcache_area(addr, size)
+ *
+ * Ensure that the data held in the cache for the buffer is invalidated.
+ *
+ * - addr - start address of the buffer
+ * - size - size of the buffer
+ *
+ * Clobbers r0 - r3
+ */
+FUNC(__invalidate_dcache_area)
+ dcache_line_size r2, r3
+ add r1, r0, r1
+ sub r3, r2, #1
+ bic r0, r0, r3
+1: mcr CP32(r0, DCIMVAC) /* invalidate D line / unified line */
+ add r0, r0, r2
+ cmp r0, r1
+ blo 1b
+ dsb sy
+ ret
+END(__invalidate_dcache_area)
+
+/*
+ * Local variables:
+ * mode: ASM
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/arm32/mpu/head.S b/xen/arch/arm/arm32/mpu/head.S
index b2c5245e51..6a631626a7 100644
--- a/xen/arch/arm/arm32/mpu/head.S
+++ b/xen/arch/arm/arm32/mpu/head.S
@@ -46,43 +46,68 @@ END(enable_mpu)
*/
FUNC(enable_boot_cpu_mm)
/* Get the number of regions specified in MPUIR_EL2 */
- mrc CP32(r5, MPUIR_EL2)
- and r5, r5, #NUM_MPU_REGIONS_MASK
+ mrc CP32(r3, MPUIR_EL2)
+ and r3, r3, #NUM_MPU_REGIONS_MASK
+
+ mov_w r0, max_mpu_regions
+ str r3, [r0]
+ mcr CP32(r0, DCIMVAC) /* Invalidate cache for max_mpu_regions addr */
/* x0: region sel */
mov r0, #0
/* Xen text section. */
mov_w r1, _stext
mov_w r2, _etext
- prepare_xen_region r0, r1, r2, r3, r4, r5, attr_prbar=REGION_TEXT_PRBAR
+ prepare_xen_region r0, r1, r2, r4, r5, r3, attr_prbar=REGION_TEXT_PRBAR
/* Xen read-only data section. */
mov_w r1, _srodata
mov_w r2, _erodata
- prepare_xen_region r0, r1, r2, r3, r4, r5, attr_prbar=REGION_RO_PRBAR
+ prepare_xen_region r0, r1, r2, r4, r5, r3, attr_prbar=REGION_RO_PRBAR
/* Xen read-only after init and data section. (RW data) */
mov_w r1, __ro_after_init_start
mov_w r2, __init_begin
- prepare_xen_region r0, r1, r2, r3, r4, r5
+ prepare_xen_region r0, r1, r2, r4, r5, r3
/* Xen code section. */
mov_w r1, __init_begin
mov_w r2, __init_data_begin
- prepare_xen_region r0, r1, r2, r3, r4, r5, attr_prbar=REGION_TEXT_PRBAR
+ prepare_xen_region r0, r1, r2, r4, r5, r3, attr_prbar=REGION_TEXT_PRBAR
/* Xen data and BSS section. */
mov_w r1, __init_data_begin
mov_w r2, __bss_end
- prepare_xen_region r0, r1, r2, r3, r4, r5
+ prepare_xen_region r0, r1, r2, r4, r5, r3
#ifdef CONFIG_EARLY_PRINTK
/* Xen early UART section. */
mov_w r1, CONFIG_EARLY_UART_BASE_ADDRESS
mov_w r2, (CONFIG_EARLY_UART_BASE_ADDRESS + CONFIG_EARLY_UART_SIZE)
- prepare_xen_region r0, r1, r2, r3, r4, r5, attr_prbar=REGION_DEVICE_PRBAR,
attr_prlar=REGION_DEVICE_PRLAR
+ prepare_xen_region r0, r1, r2, r4, r5, r3, attr_prbar=REGION_DEVICE_PRBAR,
attr_prlar=REGION_DEVICE_PRLAR
#endif
+zero_mpu:
+ /* Reset remaining MPU regions */
+ cmp r0, r3
+ beq out_zero_mpu
+ mov r1, #0
+ mov r2, #1
+ prepare_xen_region r0, r1, r2, r4, r5, r3, attr_prlar=REGION_DISABLED_PRLAR
+ b zero_mpu
+
+out_zero_mpu:
+ /* Invalidate data cache for MPU data structures */
+ mov r4, lr
+ mov_w r0, xen_mpumap_mask
+ mov r1, #XEN_MPUMAP_MASK_sizeof
+ bl __invalidate_dcache_area
+
+ ldr r0, =xen_mpumap
+ mov r1, #XEN_MPUMAP_sizeof
+ bl __invalidate_dcache_area
+ mov lr, r4
+
b enable_mpu
END(enable_boot_cpu_mm)
diff --git a/xen/arch/arm/include/asm/mpu/regions.inc
b/xen/arch/arm/include/asm/mpu/regions.inc
index 6b8c233e6c..23fead3b21 100644
--- a/xen/arch/arm/include/asm/mpu/regions.inc
+++ b/xen/arch/arm/include/asm/mpu/regions.inc
@@ -24,7 +24,7 @@
#define XEN_MPUMAP_ENTRY_SHIFT 0x3 /* 8 byte structure */
.macro store_pair reg1, reg2, dst
- .word 0xe7f000f0 /* unimplemented */
+ strd \reg1, \reg2, [\dst]
.endm
#endif
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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