[PATCH v4 04/13] arm: cpu: add arm64 specific code
Raphael Poggi
poggi.raph at gmail.com
Wed Jun 29 01:22:11 PDT 2016
This patch adds arm64 specific codes, which are:
- exception support
- cache support
- rework Makefile to support arm64
Signed-off-by: Raphael Poggi <poggi.raph at gmail.com>
---
arch/arm/cpu/Makefile | 26 +++++--
arch/arm/cpu/cache-armv8.S | 168 +++++++++++++++++++++++++++++++++++++++++++
arch/arm/cpu/cache.c | 19 +++++
arch/arm/cpu/exceptions_64.S | 127 ++++++++++++++++++++++++++++++++
arch/arm/cpu/interrupts.c | 47 ++++++++++++
arch/arm/cpu/lowlevel_64.S | 40 +++++++++++
arch/arm/cpu/setupc_64.S | 18 +++++
arch/arm/include/asm/cache.h | 9 +++
8 files changed, 450 insertions(+), 4 deletions(-)
create mode 100644 arch/arm/cpu/cache-armv8.S
create mode 100644 arch/arm/cpu/exceptions_64.S
create mode 100644 arch/arm/cpu/lowlevel_64.S
create mode 100644 arch/arm/cpu/setupc_64.S
diff --git a/arch/arm/cpu/Makefile b/arch/arm/cpu/Makefile
index 854df60e..7eb06fb 100644
--- a/arch/arm/cpu/Makefile
+++ b/arch/arm/cpu/Makefile
@@ -1,7 +1,24 @@
obj-y += cpu.o
+
+ifeq ($(CONFIG_CPU_64v8), y)
+obj-$(CONFIG_ARM_EXCEPTIONS) += exceptions_64.o
+obj-$(CONFIG_MMU) += mmu_64.o
+lwl-y += lowlevel_64.o
+else
obj-$(CONFIG_ARM_EXCEPTIONS) += exceptions.o
+obj-$(CONFIG_MMU) += mmu.o mmu-early.o
+pbl-$(CONFIG_MMU) += mmu-early.o
+lwl-y += lowlevel.o
+endif
+
obj-$(CONFIG_ARM_EXCEPTIONS) += interrupts.o
-obj-y += start.o setupc.o entry.o
+obj-y += start.o entry.o
+
+ifeq ($(CONFIG_CPU_64v8), y)
+obj-y += setupc_64.o
+else
+obj-y += setupc.o
+endif
#
# Any variants can be called as start-armxyz.S
@@ -11,7 +28,6 @@ obj-$(CONFIG_CMD_ARM_MMUINFO) += mmuinfo.o
obj-$(CONFIG_OFDEVICE) += dtb.o
obj-$(CONFIG_MMU) += mmu.o cache.o mmu-early.o
pbl-$(CONFIG_MMU) += mmu-early.o
-
ifeq ($(CONFIG_MMU),)
obj-y += no-mmu.o
endif
@@ -27,6 +43,10 @@ obj-$(CONFIG_CPU_32v7) += cache-armv7.o
AFLAGS_pbl-cache-armv7.o :=-Wa,-march=armv7-a
pbl-$(CONFIG_CPU_32v7) += cache-armv7.o
obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o
+AFLAGS_cache-armv8.o :=-Wa,-march=armv8-a
+obj-$(CONFIG_CPU_64v8) += cache-armv8.o
+AFLAGS_pbl-cache-armv8.o :=-Wa,-march=armv8-a
+pbl-$(CONFIG_CPU_64v8) += cache-armv8.o
pbl-y += setupc.o entry.o
pbl-$(CONFIG_PBL_SINGLE_IMAGE) += start-pbl.o
@@ -34,5 +54,3 @@ pbl-$(CONFIG_PBL_MULTI_IMAGES) += uncompress.o
obj-y += common.o cache.o
pbl-y += common.o cache.o
-
-lwl-y += lowlevel.o
diff --git a/arch/arm/cpu/cache-armv8.S b/arch/arm/cpu/cache-armv8.S
new file mode 100644
index 0000000..82b2f81
--- /dev/null
+++ b/arch/arm/cpu/cache-armv8.S
@@ -0,0 +1,168 @@
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua at phytium.com.cn>
+ *
+ * This file is based on sample code from ARMv8 ARM.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/linkage.h>
+#include <init.h>
+
+/*
+ * void v8_flush_dcache_level(level)
+ *
+ * clean and invalidate one level cache.
+ *
+ * x0: cache level
+ * x1: 0 flush & invalidate, 1 invalidate only
+ * x2~x9: clobbered
+ */
+.section .text.v8_flush_dcache_level
+ENTRY(v8_flush_dcache_level)
+ lsl x12, x0, #1
+ msr csselr_el1, x12 /* select cache level */
+ isb /* sync change of cssidr_el1 */
+ mrs x6, ccsidr_el1 /* read the new cssidr_el1 */
+ and x2, x6, #7 /* x2 <- log2(cache line size)-4 */
+ add x2, x2, #4 /* x2 <- log2(cache line size) */
+ mov x3, #0x3ff
+ and x3, x3, x6, lsr #3 /* x3 <- max number of #ways */
+ clz w5, w3 /* bit position of #ways */
+ mov x4, #0x7fff
+ and x4, x4, x6, lsr #13 /* x4 <- max number of #sets */
+ /* x12 <- cache level << 1 */
+ /* x2 <- line length offset */
+ /* x3 <- number of cache ways - 1 */
+ /* x4 <- number of cache sets - 1 */
+ /* x5 <- bit position of #ways */
+
+loop_set:
+ mov x6, x3 /* x6 <- working copy of #ways */
+loop_way:
+ lsl x7, x6, x5
+ orr x9, x12, x7 /* map way and level to cisw value */
+ lsl x7, x4, x2
+ orr x9, x9, x7 /* map set number to cisw value */
+ tbz w1, #0, 1f
+ dc isw, x9
+ b 2f
+1: dc cisw, x9 /* clean & invalidate by set/way */
+2: subs x6, x6, #1 /* decrement the way */
+ b.ge loop_way
+ subs x4, x4, #1 /* decrement the set */
+ b.ge loop_set
+
+ ret
+ENDPROC(v8_flush_dcache_level)
+
+/*
+ * void v8_flush_dcache_all(int invalidate_only)
+ *
+ * x0: 0 flush & invalidate, 1 invalidate only
+ *
+ * clean and invalidate all data cache by SET/WAY.
+ */
+.section .text.v8_dcache_all
+ENTRY(v8_dcache_all)
+ mov x1, x0
+ dsb sy
+ mrs x10, clidr_el1 /* read clidr_el1 */
+ lsr x11, x10, #24
+ and x11, x11, #0x7 /* x11 <- loc */
+ cbz x11, finished /* if loc is 0, exit */
+ mov x15, x30
+ mov x0, #0 /* start flush at cache level 0 */
+ /* x0 <- cache level */
+ /* x10 <- clidr_el1 */
+ /* x11 <- loc */
+ /* x15 <- return address */
+
+loop_level:
+ lsl x12, x0, #1
+ add x12, x12, x0 /* x0 <- tripled cache level */
+ lsr x12, x10, x12
+ and x12, x12, #7 /* x12 <- cache type */
+ cmp x12, #2
+ b.lt skip /* skip if no cache or icache */
+ bl v8_flush_dcache_level /* x1 = 0 flush, 1 invalidate */
+skip:
+ add x0, x0, #1 /* increment cache level */
+ cmp x11, x0
+ b.gt loop_level
+
+ mov x0, #0
+ msr csselr_el1, x0 /* restore csselr_el1 */
+ dsb sy
+ isb
+ mov x30, x15
+
+finished:
+ ret
+ENDPROC(v8_dcache_all)
+
+.section .text.v8_flush_dcache_all
+ENTRY(v8_flush_dcache_all)
+ mov x16, x30
+ mov x0, #0
+ bl v8_dcache_all
+ mov x30, x16
+ ret
+ENDPROC(v8_flush_dcache_all)
+
+.section .text.v8_invalidate_dcache_all
+ENTRY(v8_invalidate_dcache_all)
+ mov x16, x30
+ mov x0, #0x1
+ bl v8_dcache_all
+ mov x30, x16
+ ret
+ENDPROC(v8_invalidate_dcache_all)
+
+/*
+ * void v8_flush_dcache_range(start, end)
+ *
+ * clean & invalidate data cache in the range
+ *
+ * x0: start address
+ * x1: end address
+ */
+.section .text.v8_flush_dcache_range
+ENTRY(v8_flush_dcache_range)
+ mrs x3, ctr_el0
+ lsr x3, x3, #16
+ and x3, x3, #0xf
+ mov x2, #4
+ lsl x2, x2, x3 /* cache line size */
+
+ /* x2 <- minimal cache line size in cache system */
+ sub x3, x2, #1
+ bic x0, x0, x3
+1: dc civac, x0 /* clean & invalidate data or unified cache */
+ add x0, x0, x2
+ cmp x0, x1
+ b.lo 1b
+ dsb sy
+ ret
+ENDPROC(v8_flush_dcache_range)
+
+/*
+ * void v8_invalidate_icache_all(void)
+ *
+ * invalidate all tlb entries.
+ */
+.section .text.v8_invalidate_icache_all
+ENTRY(v8_invalidate_icache_all)
+ ic ialluis
+ isb sy
+ ret
+ENDPROC(v8_invalidate_icache_all)
+
+.section .text.v8_flush_l3_cache
+ENTRY(v8_flush_l3_cache)
+ mov x0, #0 /* return status as success */
+ ret
+ENDPROC(v8_flush_l3_cache)
+ .weak v8_flush_l3_cache
diff --git a/arch/arm/cpu/cache.c b/arch/arm/cpu/cache.c
index 27ead1c..929c385 100644
--- a/arch/arm/cpu/cache.c
+++ b/arch/arm/cpu/cache.c
@@ -36,6 +36,7 @@ DEFINE_CPU_FNS(v4)
DEFINE_CPU_FNS(v5)
DEFINE_CPU_FNS(v6)
DEFINE_CPU_FNS(v7)
+DEFINE_CPU_FNS(v8)
void __dma_clean_range(unsigned long start, unsigned long end)
{
@@ -101,6 +102,11 @@ int arm_set_cache_functions(void)
cache_fns = &cache_fns_armv7;
break;
#endif
+#ifdef CONFIG_CPU_64v8
+ case CPU_ARCH_ARMv8:
+ cache_fns = &cache_fns_armv8;
+ break;
+#endif
default:
while(1);
}
@@ -138,6 +144,11 @@ void arm_early_mmu_cache_flush(void)
v7_mmu_cache_flush();
return;
#endif
+#ifdef CONFIG_CPU_64v8
+ case CPU_ARCH_ARMv8:
+ v8_dcache_all();
+ return;
+#endif
}
}
@@ -146,6 +157,7 @@ void v7_mmu_cache_invalidate(void);
void arm_early_mmu_cache_invalidate(void)
{
switch (arm_early_get_cpu_architecture()) {
+#if __LINUX_ARM_ARCH__ <= 7
case CPU_ARCH_ARMv4T:
case CPU_ARCH_ARMv5:
case CPU_ARCH_ARMv5T:
@@ -159,5 +171,12 @@ void arm_early_mmu_cache_invalidate(void)
v7_mmu_cache_invalidate();
return;
#endif
+#else
+#ifdef CONFIG_CPU_64v8
+ case CPU_ARCH_ARMv8:
+ v8_invalidate_icache_all();
+ return;
+#endif
+#endif
}
}
diff --git a/arch/arm/cpu/exceptions_64.S b/arch/arm/cpu/exceptions_64.S
new file mode 100644
index 0000000..5812025
--- /dev/null
+++ b/arch/arm/cpu/exceptions_64.S
@@ -0,0 +1,127 @@
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua at phytium.com.cn>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm/ptrace.h>
+#include <linux/linkage.h>
+
+/*
+ * Enter Exception.
+ * This will save the processor state that is ELR/X0~X30
+ * to the stack frame.
+ */
+.macro exception_entry
+ stp x29, x30, [sp, #-16]!
+ stp x27, x28, [sp, #-16]!
+ stp x25, x26, [sp, #-16]!
+ stp x23, x24, [sp, #-16]!
+ stp x21, x22, [sp, #-16]!
+ stp x19, x20, [sp, #-16]!
+ stp x17, x18, [sp, #-16]!
+ stp x15, x16, [sp, #-16]!
+ stp x13, x14, [sp, #-16]!
+ stp x11, x12, [sp, #-16]!
+ stp x9, x10, [sp, #-16]!
+ stp x7, x8, [sp, #-16]!
+ stp x5, x6, [sp, #-16]!
+ stp x3, x4, [sp, #-16]!
+ stp x1, x2, [sp, #-16]!
+
+ /* Could be running at EL3/EL2/EL1 */
+ mrs x11, CurrentEL
+ cmp x11, #0xC /* Check EL3 state */
+ b.eq 1f
+ cmp x11, #0x8 /* Check EL2 state */
+ b.eq 2f
+ cmp x11, #0x4 /* Check EL1 state */
+ b.eq 3f
+3: mrs x1, esr_el3
+ mrs x2, elr_el3
+ b 0f
+2: mrs x1, esr_el2
+ mrs x2, elr_el2
+ b 0f
+1: mrs x1, esr_el1
+ mrs x2, elr_el1
+0:
+ stp x2, x0, [sp, #-16]!
+ mov x0, sp
+.endm
+
+/*
+ * Exception vectors.
+ */
+ .align 11
+ .globl vectors
+vectors:
+ .align 7
+ b _do_bad_sync /* Current EL Synchronous Thread */
+
+ .align 7
+ b _do_bad_irq /* Current EL IRQ Thread */
+
+ .align 7
+ b _do_bad_fiq /* Current EL FIQ Thread */
+
+ .align 7
+ b _do_bad_error /* Current EL Error Thread */
+
+ .align 7
+ b _do_sync /* Current EL Synchronous Handler */
+
+ .align 7
+ b _do_irq /* Current EL IRQ Handler */
+
+ .align 7
+ b _do_fiq /* Current EL FIQ Handler */
+
+ .align 7
+ b _do_error /* Current EL Error Handler */
+
+
+_do_bad_sync:
+ exception_entry
+ bl do_bad_sync
+
+_do_bad_irq:
+ exception_entry
+ bl do_bad_irq
+
+_do_bad_fiq:
+ exception_entry
+ bl do_bad_fiq
+
+_do_bad_error:
+ exception_entry
+ bl do_bad_error
+
+_do_sync:
+ exception_entry
+ bl do_sync
+
+_do_irq:
+ exception_entry
+ bl do_irq
+
+_do_fiq:
+ exception_entry
+ bl do_fiq
+
+_do_error:
+ exception_entry
+ bl do_error
+
+.section .data
+.align 4
+.global arm_ignore_data_abort
+arm_ignore_data_abort:
+.word 0 /* When != 0 data aborts are ignored */
+.global arm_data_abort_occurred
+arm_data_abort_occurred:
+.word 0 /* set != 0 by the data abort handler */
+abort_stack:
+.space 8
diff --git a/arch/arm/cpu/interrupts.c b/arch/arm/cpu/interrupts.c
index fb4bb78..c34108a 100644
--- a/arch/arm/cpu/interrupts.c
+++ b/arch/arm/cpu/interrupts.c
@@ -27,6 +27,8 @@
#include <asm/ptrace.h>
#include <asm/unwind.h>
+
+#if __LINUX_ARM_ARCH__ <= 7
/**
* Display current register set content
* @param[in] regs Guess what
@@ -70,10 +72,13 @@ void show_regs (struct pt_regs *regs)
unwind_backtrace(regs);
#endif
}
+#endif
static void __noreturn do_exception(struct pt_regs *pt_regs)
{
+#if __LINUX_ARM_ARCH__ <= 7
show_regs(pt_regs);
+#endif
panic("");
}
@@ -121,6 +126,8 @@ void do_prefetch_abort (struct pt_regs *pt_regs)
*/
void do_data_abort (struct pt_regs *pt_regs)
{
+
+#if __LINUX_ARM_ARCH__ <= 7
u32 far;
asm volatile ("mrc p15, 0, %0, c6, c0, 0" : "=r" (far) : : "cc");
@@ -128,6 +135,7 @@ void do_data_abort (struct pt_regs *pt_regs)
printf("unable to handle %s at address 0x%08x\n",
far < PAGE_SIZE ? "NULL pointer dereference" :
"paging request", far);
+#endif
do_exception(pt_regs);
}
@@ -156,6 +164,45 @@ void do_irq (struct pt_regs *pt_regs)
do_exception(pt_regs);
}
+#ifdef CONFIG_CPU_64v8
+void do_bad_sync(struct pt_regs *pt_regs)
+{
+ printf("bad sync\n");
+ do_exception(pt_regs);
+}
+
+void do_bad_irq(struct pt_regs *pt_regs)
+{
+ printf("bad irq\n");
+ do_exception(pt_regs);
+}
+
+void do_bad_fiq(struct pt_regs *pt_regs)
+{
+ printf("bad fiq\n");
+ do_exception(pt_regs);
+}
+
+void do_bad_error(struct pt_regs *pt_regs)
+{
+ printf("bad error\n");
+ do_exception(pt_regs);
+}
+
+void do_sync(struct pt_regs *pt_regs)
+{
+ printf("sync exception\n");
+ do_exception(pt_regs);
+}
+
+
+void do_error(struct pt_regs *pt_regs)
+{
+ printf("error exception\n");
+ do_exception(pt_regs);
+}
+#endif
+
extern volatile int arm_ignore_data_abort;
extern volatile int arm_data_abort_occurred;
diff --git a/arch/arm/cpu/lowlevel_64.S b/arch/arm/cpu/lowlevel_64.S
new file mode 100644
index 0000000..4850895
--- /dev/null
+++ b/arch/arm/cpu/lowlevel_64.S
@@ -0,0 +1,40 @@
+#include <linux/linkage.h>
+#include <init.h>
+#include <asm/system.h>
+
+.section ".text_bare_init_","ax"
+ENTRY(arm_cpu_lowlevel_init)
+ adr x0, vectors
+ mrs x1, CurrentEL
+ cmp x1, #0xC /* Check EL3 state */
+ b.eq 1f
+ cmp x1, #0x8 /* Check EL2 state */
+ b.eq 2f
+ cmp x1, #0x4 /* Check EL1 state */
+ b.eq 3f
+
+1:
+ msr vbar_el3, x0
+ mov x0, #1 /* Non-Secure EL0/1 */
+ orr x0, x0, #(1 << 10) /* 64-bit EL2 */
+ msr scr_el3, x0
+ msr cptr_el3, xzr
+ b done
+
+2:
+ msr vbar_el2, x0
+ mov x0, #0x33ff /* Enable FP/SIMD */
+ msr cptr_el2, x0
+ b done
+
+
+3:
+ msr vbar_el1, x0
+ mov x0, #(3 << 20) /* Enable FP/SIMD */
+ msr cpacr_el1, x0
+ b done
+
+done:
+ ret
+
+ENDPROC(arm_cpu_lowlevel_init)
diff --git a/arch/arm/cpu/setupc_64.S b/arch/arm/cpu/setupc_64.S
new file mode 100644
index 0000000..3515854
--- /dev/null
+++ b/arch/arm/cpu/setupc_64.S
@@ -0,0 +1,18 @@
+#include <linux/linkage.h>
+#include <asm/sections.h>
+
+.section .text.setupc
+
+/*
+ * setup_c: clear bss
+ */
+ENTRY(setup_c)
+ mov x15, x30
+ ldr x0, =__bss_start
+ mov x1, #0
+ ldr x2, =__bss_stop
+ sub x2, x2, x0
+ bl memset /* clear bss */
+ mov x30, x15
+ ret
+ENDPROC(setup_c)
diff --git a/arch/arm/include/asm/cache.h b/arch/arm/include/asm/cache.h
index 2f6eab0..8fcdb64 100644
--- a/arch/arm/include/asm/cache.h
+++ b/arch/arm/include/asm/cache.h
@@ -1,9 +1,18 @@
#ifndef __ASM_CACHE_H
#define __ASM_CACHE_H
+#ifdef CONFIG_CPU_64v8
+extern void v8_invalidate_icache_all(void);
+extern void v8_dcache_all(void);
+#endif
+
static inline void flush_icache(void)
{
+#if __LINUX_ARM_ARCH__ <= 7
asm volatile("mcr p15, 0, %0, c7, c5, 0" : : "r" (0));
+#else
+ v8_invalidate_icache_all();
+#endif
}
int arm_set_cache_functions(void);
--
2.1.0
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