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[src/trunk]: src/sys/arch/arm/arm Restructure so that storing of uboot args (...
details: https://anonhg.NetBSD.org/src/rev/ab44e8b81687
branches: trunk
changeset: 840366:ab44e8b81687
user: skrll <skrll%NetBSD.org@localhost>
date: Thu Apr 04 14:24:20 2019 +0000
description:
Restructure so that storing of uboot args (including FDT address) and
virtual to physical offset is done after armv[67]_init where we ensure
MMU and caches are off, and cache is invalidated.
diffstat:
sys/arch/arm/arm/armv6_start.S | 158 ++++++++++++++++++++++++----------------
1 files changed, 93 insertions(+), 65 deletions(-)
diffs (truncated from 359 to 300 lines):
diff -r cb57243666b6 -r ab44e8b81687 sys/arch/arm/arm/armv6_start.S
--- a/sys/arch/arm/arm/armv6_start.S Thu Apr 04 14:03:40 2019 +0000
+++ b/sys/arch/arm/arm/armv6_start.S Thu Apr 04 14:24:20 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: armv6_start.S,v 1.10 2019/04/03 17:55:27 skrll Exp $ */
+/* $NetBSD: armv6_start.S,v 1.11 2019/04/04 14:24:20 skrll Exp $ */
/*-
* Copyright (c) 2012, 2017, 2018 The NetBSD Foundation, Inc.
@@ -91,6 +91,7 @@
R_TMP2 .req r9
R_VTOPDIFF .req r10
R_FDTADDR .req r11
+ R_INDEX .req r11
.text
@@ -127,33 +128,15 @@
VPRINTF("\n\rsp : ")
VPRINTX(sp)
- ldr R_TMP1, =kern_vtopdiff
- sub R_TMP1, R_TMP1, R_VTOPDIFF
- str R_VTOPDIFF, [R_TMP1]
-
ldr R_TMP1, =(L1_S_SIZE - 1)
ands R_TMP2, R_VTOPDIFF, R_TMP1
bne arm_bad_vtopdiff
- /*
- * store uboot arguments to uboot_args[4]
- */
- ldr R_TMP1, =uboot_args
- sub R_TMP1, R_TMP1, R_VTOPDIFF
-
- str r4, [R_TMP1, #(4*0)]
- str r5, [R_TMP1, #(4*1)]
- str r6, [R_TMP1, #(4*2)]
- str r7, [R_TMP1, #(4*3)]
-
#if defined(FDTBASE)
/*
* ARM boot protocol has FDT address in r2 which is now in r6
*/
VPRINTF("\n\rfdt : ")
- ldr R_TMP1, =fdt_addr_r
- sub R_TMP1, R_TMP1, R_VTOPDIFF
- str r6, [R_TMP1]
mov R_FDTADDR, r6 // Save fdt_addr_r for mapping later
VPRINTX(r6)
@@ -195,6 +178,58 @@
1: b 1b
ASEND(generic_start)
+generic_vstart:
+ VPRINTF("go\n\r")
+
+ /*
+ * Jump to start in locore.S, which in turn will call initarm and main.
+ */
+ b start
+
+/*
+ * Save the u-boot arguments (including FDT address) and the virtual to physical
+ * offset.
+ *
+ * Uses the following callee saved registers:
+ *
+ * r8 (R_TMP1), r9 (R_TMP2)
+ */
+generic_savevars:
+ mov R_TMP1, lr
+ /*
+ * Store virtual to physical address difference
+ */
+ ldr R_TMP2, =kern_vtopdiff
+ sub R_TMP2, R_TMP2, R_VTOPDIFF
+ str R_VTOPDIFF, [R_TMP2]
+
+ /*
+ * store uboot arguments to uboot_args[4]
+ */
+ ldr R_TMP2, =uboot_args
+ sub R_TMP2, R_VTOPDIFF
+
+ VPRINTF("\n\ruboot : @")
+ VPRINTX(R_TMP2)
+ str r4, [R_TMP2, #(4*0)]
+ str r5, [R_TMP2, #(4*1)]
+ str r6, [R_TMP2, #(4*2)]
+ str r7, [R_TMP2, #(4*3)]
+
+#if defined(FDTBASE)
+ /*
+ * ARM boot protocol has FDT address in r2 which is now in r6
+ */
+ VPRINTF("\n\rfdt : ")
+ ldr R_TMP2, =fdt_addr_r
+ sub R_TMP2, R_VTOPDIFF
+ str r6, [R_TMP2]
+
+ VPRINTX(r6)
+#endif
+
+ RETr(R_TMP1)
+
.ltorg
/* Allocate some memory after the kernel image for stacks and bootstrap L1PT */
@@ -413,40 +448,34 @@
.arch_extension sec
.arch_extension virt
- VPRINTF("v7 :")
+ VPRINTF("v7 : ")
bl armv7_init
+ bl generic_savevars
mov R_DEVATTR, #L1_S_V6_XN
bl arm_build_translation_table
/*
- * Turn on the MMU. Return to new enabled address space.
+ * Turn on the MMU. Return to virtual address space.
*/
movw r0, #:lower16:TEMP_L1_TABLE
movt r0, #:upper16:TEMP_L1_TABLE
sub r0, R_VTOPDIFF
// Return to virtual addess after the call to armv7_mmuinit
- movw lr, #:lower16:1f
- movt lr, #:upper16:1f
+ movw lr, #:lower16:generic_vstart
+ movt lr, #:upper16:generic_vstart
b armv7_mmuinit
-1:
-
- VPRINTF("go\n\r")
-
- /*
- * Jump to start in locore.S, which in turn will call initarm and main.
- */
- b start
/* NOTREACHED */
.ltorg
#elif defined(_ARM_ARCH_6)
generic_startv6:
- VPRINTF("v6: ")
+ VPRINTF("v6 : ")
bl armv6_init
+ bl generic_savevars
#ifdef ARM_MMU_EXTENDED
mov R_DEVATTR, #L1_S_V6_XN
@@ -462,15 +491,8 @@
ldr r0, =TEMP_L1_TABLE
sub r0, R_VTOPDIFF
- ldr lr, =1f
+ ldr lr, =generic_vstart
b armv6_mmuinit
-1:
- VPRINTF("go\n\r")
-
- /*
- * Jump to start in locore.S, which in turn will call initarm and main.
- */
- b start
/* NOTREACHED */
.ltorg
@@ -530,8 +552,7 @@
*
* Uses the following callee saved registers:
*
- * Callee saved:
- * r4, r5, r6, r7
+ * r8 (R_TMP1), r9 (R_TMP2)
*/
armv7_init:
@@ -539,8 +560,8 @@
.arch_extension sec
.arch_extension virt
- mov r4, lr
- mov r5, sp
+ mov R_TMP1, lr
+ mov R_TMP2, sp
/*
* Leave HYP mode and move into supervisor mode with IRQs/FIQs
@@ -577,7 +598,7 @@
mov r0, #0
msr spsr_sxc, r0 // set SPSR[23:8] to known value
- mov sp, r5
+ mov sp, R_TMP2
XPUTC('A')
@@ -606,11 +627,11 @@
movw r2, #:lower16:ARMV7_SCTLR_SET
movt r2, #:upper16:ARMV7_SCTLR_SET
- mov r7, r0 // save for printing
- bic r6, r0, r1 // disable icache/dcache/mmu
- orr r6, r6, r2 //
+ mov R_TMP2, r0 // save for printing
+ bic r0, r0, r1 // disable icache/dcache/mmu
+ orr r0, r0, r2 // enable unaligned access
- mcr p15, 0, r6, c1, c0, 0 // SCTLR write
+ mcr p15, 0, r0, c1, c0, 0 // SCTLR write
dsb
isb
@@ -619,17 +640,20 @@
dsb
isb
+#ifdef VERBOSE_INIT_ARM
XPUTC(#'B')
VPRINTF(" sctlr:")
- VPRINTX(r7)
+ VPRINTX(R_TMP2)
VPRINTF("/")
- VPRINTX(r6)
+ mrc p15, 0, r0, c1, c0, 0
+ VPRINTX(r0)
VPRINTF(" ")
XPUTC(#'C')
+#endif
- bx r4 // return
+ bx R_TMP1 // return
.ltorg
@@ -778,12 +802,12 @@
// Not found our mpidr in the list - use Aff0 for cpuindex
and r0, r4, #7
2:
- mov R_TMP2, r0 // save cpu_index for later
+ mov R_INDEX, r0 // save cpu_index for later
ldr R_TMP1, =start_stacks_top
sub sp, R_TMP1, R_VTOPDIFF
- mov r5, R_TMP2
+ mov r5, R_INDEX
lsl r5, #INIT_ARM_STACK_SHIFT
sub sp, sp, r5
@@ -799,7 +823,7 @@
VPRINTX(r0)
#endif
VPRINTF("\n\rindex : ")
- VPRINTX(R_TMP2)
+ VPRINTX(R_INDEX)
VPRINTF("\n\rsp : ")
VPRINTX(sp)
XPUTC('\n')
@@ -827,7 +851,7 @@
VPRINTF("go\n\r")
- mov r0, R_TMP2 // index into cpu_mpidr[] or cpu_number if not found
+ mov r0, R_INDEX // index into cpu_mpidr[] or cpu_number if not found
bl cpu_init_secondary_processor
/* Wait for cpu_boot_secondary_processors the when cpu_info is allocated, etc */
@@ -836,7 +860,7 @@
movt r6, #:upper16:arm_cpu_mbox
mov r5, #1 // bitmask...
- lsl r5, R_TMP2 // ... for our cpu
+ lsl r5, R_INDEX // ... for our cpu
1: dmb // data memory barrier
ldr r2, [r6] // load mbox
@@ -846,7 +870,7 @@
movw r0, #:lower16:cpu_info
movt r0, #:upper16:cpu_info // get pointer to cpu_infos
- ldr r5, [r0, R_TMP2, lsl #2] // load our cpu_info
+ ldr r5, [r0, R_INDEX, lsl #2] // load our cpu_info
ldr r6, [r5, #CI_IDLELWP] // get the idlelwp
ldr r7, [r6, #L_PCB] // now get its pcb
ldr sp, [r7, #PCB_KSP] // finally, we can load our SP
@@ -860,7 +884,7 @@
str r6, [r5, #CI_CURLWP] // and note we are running on it
mov r0, r5 // pass cpu_info
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