help
Can we use information of configuration file?
+config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
+ bool "Initialize Xtensa MMU inside the Linux kernel code"
+ default y
+ help
+ Earlier version initialized the MMU in the exception vector
+ before jumping to _startup in head.S and had an advantage that
+ it was possible to place a software breakpoint at 'reset' and
+ then enter your normal kernel breakpoints once the MMU was mapped
+ to the kernel mappings (0XC0000000).
+
+ This unfortunately doesn't work for U-Boot and likley also wont
+ work for using KEXEC to have a hot kernel ready for doing a
+ KDUMP.
+
+ So now the MMU is initialized in head.S but it's necessary to
+ use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
+ xt-gdb can't place a Software Breakpoint in the 0XD region prior
+ to mapping the MMU and after mapping even if the area of low memory
+ was mapped gdb wouldn't remove the breakpoint on hitting it as the
+ PC wouldn't match. Since Hardware Breakpoints are recommended for
+ Linux configurations it seems reasonable to just assume they exist
+ and leave this older mechanism for unfortunate souls that choose
+ not to follow Tensilica's recommendation.
+
+ Selecting this will cause U-Boot to set the KERNEL Load and Entry
+ address at 0x00003000 instead of the mapped std of 0xD0003000.
+
+ If in doubt, say Y.
+
endmenu
config XTENSA_CALIBRATE_CCOUNT
export OBJCOPY_ARGS
export CPPFLAGS_boot.lds += -P -C
+export KBUILD_AFLAGS += -mtext-section-literals
boot-y := bootstrap.o
-#include <variant/core.h>
+/*
+ * linux/arch/xtensa/boot/boot-elf/boot.lds.S
+ *
+ * Copyright (C) 2008 - 2013 by Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Marc Gauthier <marc@tensilica.com
+ * Pete Delaney <piet@tensilica.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <asm/vectors.h>
OUTPUT_ARCH(xtensa)
ENTRY(_ResetVector)
SECTIONS
{
- .start 0xD0000000 : { *(.start) }
-
- .text 0xD0000000:
- {
- __reloc_start = . ;
- _text_start = . ;
- *(.literal .text.literal .text)
- _text_end = . ;
- }
-
- .rodata ALIGN(0x04):
- {
- *(.rodata)
- *(.rodata1)
- }
-
- .data ALIGN(0x04):
+ .ResetVector.text XCHAL_RESET_VECTOR_VADDR :
{
- *(.data)
- *(.data1)
- *(.sdata)
- *(.sdata2)
- *(.got.plt)
- *(.got)
- *(.dynamic)
+ *(.ResetVector.text)
}
- __reloc_end = . ;
-
- . = ALIGN(0x10);
- __image_load = . ;
- .image 0xd0001000:
+ .image KERNELOFFSET: AT (LOAD_MEMORY_ADDRESS)
{
_image_start = .;
*(image)
_image_end = . ;
}
-
.bss ((LOADADDR(.image) + SIZEOF(.image) + 3) & ~ 3):
{
__bss_start = .;
*(.bss)
__bss_end = .;
}
- _end = .;
- _param_start = .;
- .ResetVector.text XCHAL_RESET_VECTOR_VADDR :
+ /*
+ * This is a remapped copy of the Reset Vector Code.
+ * It keeps gdb in sync with the PC after switching
+ * to the temporary mapping used while setting up
+ * the V2 MMU mappings for Linux.
+ */
+ .ResetVector.remapped_text 0x46000000 (INFO):
{
- *(.ResetVector.text)
+ *(.ResetVector.remapped_text)
}
-
-
- PROVIDE (end = .);
}
+/*
+ * arch/xtensa/boot/boot-elf/bootstrap.S
+ *
+ * Low-level exception handling
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004 - 2013 by Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Marc Gauthier <marc@tensilica.com>
+ * Piet Delaney <piet@tensilica.com>
+ */
#include <asm/bootparam.h>
+#include <asm/processor.h>
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/cacheasm.h>
+#include <asm/initialize_mmu.h>
+#include <linux/linkage.h>
-
-/* ResetVector
- */
- .section .ResetVector.text, "ax"
+ .section .ResetVector.text, "ax"
.global _ResetVector
+ .global reset
+
_ResetVector:
- _j reset
+ _j _SetupMMU
+
+ .begin no-absolute-literals
+ .literal_position
+
.align 4
RomInitAddr:
- .word 0xd0001000
+#if defined(CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) && \
+ XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
+ .word 0x00003000
+#else
+ .word 0xd0003000
+#endif
RomBootParam:
.word _bootparam
+_bootparam:
+ .short BP_TAG_FIRST
+ .short 4
+ .long BP_VERSION
+ .short BP_TAG_LAST
+ .short 0
+ .long 0
+
+ .align 4
+_SetupMMU:
+ movi a0, 0
+ wsr a0, windowbase
+ rsync
+ movi a0, 1
+ wsr a0, windowstart
+ rsync
+ movi a0, 0x1F
+ wsr a0, ps
+ rsync
+
+ Offset = _SetupMMU - _ResetVector
+
+#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
+ initialize_mmu
+#endif
+
+ .end no-absolute-literals
+
+ rsil a0, XCHAL_DEBUGLEVEL-1
+ rsync
reset:
l32r a0, RomInitAddr
l32r a2, RomBootParam
jx a0
.align 4
- .section .bootstrap.data, "aw"
- .globl _bootparam
-_bootparam:
- .short BP_TAG_FIRST
- .short 4
- .long BP_VERSION
- .short BP_TAG_LAST
- .short 0
- .long 0
+ .section .ResetVector.remapped_text, "x"
+ .global _RemappedResetVector
+
+ /* Do org before literals */
+ .org 0
+
+_RemappedResetVector:
+ .begin no-absolute-literals
+ .literal_position
+
+ _j _RemappedSetupMMU
+
+ /* Position Remapped code at the same location as the original code */
+ . = _RemappedResetVector + Offset
+
+_RemappedSetupMMU:
+#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
+ initialize_mmu
+#endif
+
+ .end no-absolute-literals
# for more details.
#
-UIMAGE_LOADADDR = 0xd0001000
+ifdef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
+UIMAGE_LOADADDR = 0x00003000
+else
+UIMAGE_LOADADDR = 0xd0003000
+endif
UIMAGE_COMPRESSION = gzip
$(obj)/../uImage: vmlinux.bin.gz FORCE
#ifndef _XTENSA_INITIALIZE_MMU_H
#define _XTENSA_INITIALIZE_MMU_H
+#include <asm/pgtable.h>
+#include <asm/vectors.h>
+
#ifdef __ASSEMBLY__
#define XTENSA_HWVERSION_RC_2009_0 230000
* (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
*/
+#if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
+/*
+ * Have MMU v3
+ */
+
+#if !XCHAL_HAVE_VECBASE
+# error "MMU v3 requires reloc vectors"
+#endif
+
+ movi a1, 0
+ _call0 1f
+ _j 2f
+
+ .align 4
+1: movi a2, 0x10000000
+ movi a3, 0x18000000
+ add a2, a2, a0
+9: bgeu a2, a3, 9b /* PC is out of the expected range */
+
+ /* Step 1: invalidate mapping at 0x40000000..0x5FFFFFFF. */
+
+ movi a2, 0x40000006
+ idtlb a2
+ iitlb a2
+ isync
+
+ /* Step 2: map 0x40000000..0x47FFFFFF to paddr containing this code
+ * and jump to the new mapping.
+ */
+#define CA_BYPASS (_PAGE_CA_BYPASS | _PAGE_HW_WRITE | _PAGE_HW_EXEC)
+#define CA_WRITEBACK (_PAGE_CA_WB | _PAGE_HW_WRITE | _PAGE_HW_EXEC)
+
+ srli a3, a0, 27
+ slli a3, a3, 27
+ addi a3, a3, CA_BYPASS
+ addi a7, a2, -1
+ wdtlb a3, a7
+ witlb a3, a7
+ isync
+
+ slli a4, a0, 5
+ srli a4, a4, 5
+ addi a5, a2, -6
+ add a4, a4, a5
+ jx a4
+
+ /* Step 3: unmap everything other than current area.
+ * Start at 0x60000000, wrap around, and end with 0x20000000
+ */
+2: movi a4, 0x20000000
+ add a5, a2, a4
+3: idtlb a5
+ iitlb a5
+ add a5, a5, a4
+ bne a5, a2, 3b
+
+ /* Step 4: Setup MMU with the old V2 mappings. */
+ movi a6, 0x01000000
+ wsr a6, ITLBCFG
+ wsr a6, DTLBCFG
+ isync
+
+ movi a5, 0xd0000005
+ movi a4, CA_WRITEBACK
+ wdtlb a4, a5
+ witlb a4, a5
+
+ movi a5, 0xd8000005
+ movi a4, CA_BYPASS
+ wdtlb a4, a5
+ witlb a4, a5
+
+ movi a5, 0xe0000006
+ movi a4, 0xf0000000 + CA_WRITEBACK
+ wdtlb a4, a5
+ witlb a4, a5
+
+ movi a5, 0xf0000006
+ movi a4, 0xf0000000 + CA_BYPASS
+ wdtlb a4, a5
+ witlb a4, a5
+
+ isync
+
+ /* Jump to self, using MMU v2 mappings. */
+ movi a4, 1f
+ jx a4
+
+1:
+ movi a2, VECBASE_RESET_VADDR
+ wsr a2, vecbase
+
+ /* Step 5: remove temporary mapping. */
+ idtlb a7
+ iitlb a7
+ isync
+
+ movi a0, 0
+ wsr a0, ptevaddr
+ rsync
+
+#endif /* defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU &&
+ XCHAL_HAVE_SPANNING_WAY */
+
.endm
#endif /*__ASSEMBLY__*/
--- /dev/null
+/*
+ * arch/xtensa/include/asm/xchal_vaddr_remap.h
+ *
+ * Xtensa macros for MMU V3 Support. Deals with re-mapping the Virtual
+ * Memory Addresses from "Virtual == Physical" to their prevvious V2 MMU
+ * mappings (KSEG at 0xD0000000 and KIO at 0XF0000000).
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 - 2012 Tensilica Inc.
+ *
+ * Pete Delaney <piet@tensilica.com>
+ * Marc Gauthier <marc@tensilica.com
+ */
+
+#ifndef _XTENSA_VECTORS_H
+#define _XTENSA_VECTORS_H
+
+#include <variant/core.h>
+
+#if defined(CONFIG_MMU)
+
+/* Will Become VECBASE */
+#define VIRTUAL_MEMORY_ADDRESS 0xD0000000
+
+/* Image Virtual Start Address */
+#define KERNELOFFSET 0xD0003000
+
+#if defined(XCHAL_HAVE_PTP_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
+ /* MMU v3 - XCHAL_HAVE_PTP_MMU == 1 */
+ #define PHYSICAL_MEMORY_ADDRESS 0x00000000
+ #define LOAD_MEMORY_ADDRESS 0x00003000
+#else
+ /* MMU V2 - XCHAL_HAVE_PTP_MMU == 0 */
+ #define PHYSICAL_MEMORY_ADDRESS 0xD0000000
+ #define LOAD_MEMORY_ADDRESS 0xD0003000
+#endif
+
+#else /* !defined(CONFIG_MMU) */
+ /* MMU Not being used - Virtual == Physical */
+
+ /* VECBASE */
+ #define VIRTUAL_MEMORY_ADDRESS 0x00002000
+
+ /* Location of the start of the kernel text, _start */
+ #define KERNELOFFSET 0x00003000
+ #define PHYSICAL_MEMORY_ADDRESS 0x00000000
+
+ /* Loaded just above possibly live vectors */
+ #define LOAD_MEMORY_ADDRESS 0x00003000
+
+#endif /* CONFIG_MMU */
+
+#define XC_VADDR(offset) (VIRTUAL_MEMORY_ADDRESS + offset)
+#define XC_PADDR(offset) (PHYSICAL_MEMORY_ADDRESS + offset)
+
+/* Used to set VECBASE register */
+#define VECBASE_RESET_VADDR VIRTUAL_MEMORY_ADDRESS
+
+#define RESET_VECTOR_VECOFS (XCHAL_RESET_VECTOR_VADDR - \
+ VECBASE_RESET_VADDR)
+#define RESET_VECTOR_VADDR XC_VADDR(RESET_VECTOR_VECOFS)
+
+#define RESET_VECTOR1_VECOFS (XCHAL_RESET_VECTOR1_VADDR - \
+ VECBASE_RESET_VADDR)
+#define RESET_VECTOR1_VADDR XC_VADDR(RESET_VECTOR1_VECOFS)
+
+#if XCHAL_HAVE_VECBASE
+
+#define USER_VECTOR_VADDR XC_VADDR(XCHAL_USER_VECOFS)
+#define KERNEL_VECTOR_VADDR XC_VADDR(XCHAL_KERNEL_VECOFS)
+#define DOUBLEEXC_VECTOR_VADDR XC_VADDR(XCHAL_DOUBLEEXC_VECOFS)
+#define WINDOW_VECTORS_VADDR XC_VADDR(XCHAL_WINDOW_OF4_VECOFS)
+#define INTLEVEL2_VECTOR_VADDR XC_VADDR(XCHAL_INTLEVEL2_VECOFS)
+#define INTLEVEL3_VECTOR_VADDR XC_VADDR(XCHAL_INTLEVEL3_VECOFS)
+#define INTLEVEL4_VECTOR_VADDR XC_VADDR(XCHAL_INTLEVEL4_VECOFS)
+#define INTLEVEL5_VECTOR_VADDR XC_VADDR(XCHAL_INTLEVEL5_VECOFS)
+#define INTLEVEL6_VECTOR_VADDR XC_VADDR(XCHAL_INTLEVEL6_VECOFS)
+
+#define DEBUG_VECTOR_VADDR XC_VADDR(XCHAL_DEBUG_VECOFS)
+
+#undef XCHAL_NMI_VECTOR_VADDR
+#define XCHAL_NMI_VECTOR_VADDR XC_VADDR(XCHAL_NMI_VECOFS)
+
+#undef XCHAL_INTLEVEL7_VECTOR_VADDR
+#define XCHAL_INTLEVEL7_VECTOR_VADDR XC_VADDR(XCHAL_INTLEVEL7_VECOFS)
+
+/*
+ * These XCHAL_* #defines from varian/core.h
+ * are not valid to use with V3 MMU. Non-XCHAL
+ * constants are defined above and should be used.
+ */
+#undef XCHAL_VECBASE_RESET_VADDR
+#undef XCHAL_RESET_VECTOR0_VADDR
+#undef XCHAL_USER_VECTOR_VADDR
+#undef XCHAL_KERNEL_VECTOR_VADDR
+#undef XCHAL_DOUBLEEXC_VECTOR_VADDR
+#undef XCHAL_WINDOW_VECTORS_VADDR
+#undef XCHAL_INTLEVEL2_VECTOR_VADDR
+#undef XCHAL_INTLEVEL3_VECTOR_VADDR
+#undef XCHAL_INTLEVEL4_VECTOR_VADDR
+#undef XCHAL_INTLEVEL5_VECTOR_VADDR
+#undef XCHAL_INTLEVEL6_VECTOR_VADDR
+#undef XCHAL_DEBUG_VECTOR_VADDR
+#undef XCHAL_NMI_VECTOR_VADDR
+#undef XCHAL_INTLEVEL7_VECTOR_VADDR
+
+#else
+
+#define USER_VECTOR_VADDR XCHAL_USER_VECTOR_VADDR
+#define KERNEL_VECTOR_VADDR XCHAL_KERNEL_VECTOR_VADDR
+#define DOUBLEEXC_VECTOR_VADDR XCHAL_DOUBLEEXC_VECTOR_VADDR
+#define WINDOW_VECTORS_VADDR XCHAL_WINDOW_VECTORS_VADDR
+#define INTLEVEL2_VECTOR_VADDR XCHAL_INTLEVEL2_VECTOR_VADDR
+#define INTLEVEL3_VECTOR_VADDR XCHAL_INTLEVEL3_VECTOR_VADDR
+#define INTLEVEL4_VECTOR_VADDR XCHAL_INTLEVEL4_VECTOR_VADDR
+#define INTLEVEL5_VECTOR_VADDR XCHAL_INTLEVEL5_VECTOR_VADDR
+#define INTLEVEL6_VECTOR_VADDR XCHAL_INTLEVEL6_VECTOR_VADDR
+#define DEBUG_VECTOR_VADDR XCHAL_DEBUG_VECTOR_VADDR
+
+#endif
+
+#endif /* _XTENSA_VECTORS_H */
obj-$(CONFIG_PCI) += pci.o
obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
+AFLAGS_head.o += -mtext-section-literals
+
# In the Xtensa architecture, assembly generates literals which must always
# precede the L32R instruction with a relative offset less than 256 kB.
# Therefore, the .text and .literal section must be combined in parenthesis
*/
__HEAD
+ .begin no-absolute-literals
+
ENTRY(_start)
- _j 2f
+ /* Preserve the pointer to the boot parameter list in EXCSAVE_1 */
+ wsr a2, excsave1
+ _j _SetupMMU
+
+ .align 4
+ .literal_position
+.Lstartup:
+ .word _startup
+
.align 4
-1: .word _startup
-2: l32r a0, 1b
+ .global _SetupMMU
+_SetupMMU:
+ Offset = _SetupMMU - _start
+
+#ifdef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
+ initialize_mmu
+#endif
+ .end no-absolute-literals
+
+ l32r a0, .Lstartup
jx a0
ENDPROC(_start)
- .section .init.text, "ax"
+ __INIT
+ .literal_position
ENTRY(_startup)
movi a0, LOCKLEVEL
wsr a0, ps
- /* Preserve the pointer to the boot parameter list in EXCSAVE_1 */
-
- wsr a2, excsave1
-
/* Start with a fresh windowbase and windowstart. */
movi a1, 1
isync
- initialize_mmu
-
/* Unpack data sections
*
* The linker script used to build the Linux kernel image
___flush_dcache_all a2 a3
#endif
+ memw
+ isync
+ ___invalidate_icache_all a2 a3
+ isync
/* Setup stack and enable window exceptions (keep irqs disabled) */
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/thread_info.h>
+#include <asm/vectors.h>
#define WINDOW_VECTORS_SIZE 0x180
xsr a0, depc # get DEPC, save a0
- movi a3, XCHAL_WINDOW_VECTORS_VADDR
+ movi a3, WINDOW_VECTORS_VADDR
_bltu a0, a3, .Lfixup
addi a3, a3, WINDOW_VECTORS_SIZE
_bgeu a0, a3, .Lfixup
#include <asm/page.h>
#include <asm/thread_info.h>
+#include <asm/vectors.h>
#include <variant/core.h>
#include <platform/hardware.h>
OUTPUT_ARCH(xtensa)
#endif
#ifndef KERNELOFFSET
-#define KERNELOFFSET 0xd0001000
+#define KERNELOFFSET 0xd0003000
#endif
/* Note: In the following macros, it would be nice to specify only the
SECTION_VECTOR (_WindowVectors_text,
.WindowVectors.text,
- XCHAL_WINDOW_VECTORS_VADDR, 4,
+ WINDOW_VECTORS_VADDR, 4,
.dummy)
SECTION_VECTOR (_DebugInterruptVector_literal,
.DebugInterruptVector.literal,
- XCHAL_DEBUG_VECTOR_VADDR - 4,
+ DEBUG_VECTOR_VADDR - 4,
SIZEOF(.WindowVectors.text),
.WindowVectors.text)
SECTION_VECTOR (_DebugInterruptVector_text,
.DebugInterruptVector.text,
- XCHAL_DEBUG_VECTOR_VADDR,
+ DEBUG_VECTOR_VADDR,
4,
.DebugInterruptVector.literal)
#undef LAST
#if XCHAL_EXCM_LEVEL >= 2
SECTION_VECTOR (_Level2InterruptVector_text,
.Level2InterruptVector.text,
- XCHAL_INTLEVEL2_VECTOR_VADDR,
+ INTLEVEL2_VECTOR_VADDR,
SIZEOF(LAST), LAST)
# undef LAST
# define LAST .Level2InterruptVector.text
#if XCHAL_EXCM_LEVEL >= 3
SECTION_VECTOR (_Level3InterruptVector_text,
.Level3InterruptVector.text,
- XCHAL_INTLEVEL3_VECTOR_VADDR,
+ INTLEVEL3_VECTOR_VADDR,
SIZEOF(LAST), LAST)
# undef LAST
# define LAST .Level3InterruptVector.text
#if XCHAL_EXCM_LEVEL >= 4
SECTION_VECTOR (_Level4InterruptVector_text,
.Level4InterruptVector.text,
- XCHAL_INTLEVEL4_VECTOR_VADDR,
+ INTLEVEL4_VECTOR_VADDR,
SIZEOF(LAST), LAST)
# undef LAST
# define LAST .Level4InterruptVector.text
#if XCHAL_EXCM_LEVEL >= 5
SECTION_VECTOR (_Level5InterruptVector_text,
.Level5InterruptVector.text,
- XCHAL_INTLEVEL5_VECTOR_VADDR,
+ INTLEVEL5_VECTOR_VADDR,
SIZEOF(LAST), LAST)
# undef LAST
# define LAST .Level5InterruptVector.text
#if XCHAL_EXCM_LEVEL >= 6
SECTION_VECTOR (_Level6InterruptVector_text,
.Level6InterruptVector.text,
- XCHAL_INTLEVEL6_VECTOR_VADDR,
+ INTLEVEL6_VECTOR_VADDR,
SIZEOF(LAST), LAST)
# undef LAST
# define LAST .Level6InterruptVector.text
#endif
SECTION_VECTOR (_KernelExceptionVector_literal,
.KernelExceptionVector.literal,
- XCHAL_KERNEL_VECTOR_VADDR - 4,
+ KERNEL_VECTOR_VADDR - 4,
SIZEOF(LAST), LAST)
#undef LAST
SECTION_VECTOR (_KernelExceptionVector_text,
.KernelExceptionVector.text,
- XCHAL_KERNEL_VECTOR_VADDR,
+ KERNEL_VECTOR_VADDR,
4,
.KernelExceptionVector.literal)
SECTION_VECTOR (_UserExceptionVector_literal,
.UserExceptionVector.literal,
- XCHAL_USER_VECTOR_VADDR - 4,
+ USER_VECTOR_VADDR - 4,
SIZEOF(.KernelExceptionVector.text),
.KernelExceptionVector.text)
SECTION_VECTOR (_UserExceptionVector_text,
.UserExceptionVector.text,
- XCHAL_USER_VECTOR_VADDR,
+ USER_VECTOR_VADDR,
4,
.UserExceptionVector.literal)
SECTION_VECTOR (_DoubleExceptionVector_literal,
.DoubleExceptionVector.literal,
- XCHAL_DOUBLEEXC_VECTOR_VADDR - 16,
+ DOUBLEEXC_VECTOR_VADDR - 16,
SIZEOF(.UserExceptionVector.text),
.UserExceptionVector.text)
SECTION_VECTOR (_DoubleExceptionVector_text,
.DoubleExceptionVector.text,
- XCHAL_DOUBLEEXC_VECTOR_VADDR,
+ DOUBLEEXC_VECTOR_VADDR,
32,
.DoubleExceptionVector.literal)
. = ALIGN(0x10);
.bootstrap : { *(.bootstrap.literal .bootstrap.text .bootstrap.data) }
- .ResetVector.text XCHAL_RESET_VECTOR_VADDR :
+ .ResetVector.text RESET_VECTOR_VADDR :
{
*(.ResetVector.text)
}
+
+ /*
+ * This is a remapped copy of the Secondary Reset Vector Code.
+ * It keeps gdb in sync with the PC after switching
+ * to the temporary mapping used while setting up
+ * the V2 MMU mappings for Linux.
+ *
+ * Only debug information about this section is put in the kernel image.
+ */
+ .SecondaryResetVector.remapped_text 0x46000000 (INFO):
+ {
+ *(.SecondaryResetVector.remapped_text)
+ }
+
+
.xt.lit : { *(.xt.lit) }
.xt.prop : { *(.xt.prop) }
*/
void __init init_mmu(void)
{
- /* Writing zeros to the <t>TLBCFG special registers ensure
- * that valid values exist in the register. For existing
- * PGSZID<w> fields, zero selects the first element of the
- * page-size array. For nonexistent PGSZID<w> fields, zero is
- * the best value to write. Also, when changing PGSZID<w>
+#if !(XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY)
+ /*
+ * Writing zeros to the instruction and data TLBCFG special
+ * registers ensure that valid values exist in the register.
+ *
+ * For existing PGSZID<w> fields, zero selects the first element
+ * of the page-size array. For nonexistent PGSZID<w> fields,
+ * zero is the best value to write. Also, when changing PGSZID<w>
* fields, the corresponding TLB must be flushed.
*/
set_itlbcfg_register(0);
set_dtlbcfg_register(0);
+#endif
flush_tlb_all();
/* Set rasid register to a known value. */
projects / mirror_ubuntu-disco-kernel.git / commitdiff