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xtensa: add XIP-aware MTD support

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Add Kconfig symbol, asm/mtd-xip.h header and define related macros:
xip_cpu_idle, xip_irqpending, xip_currtime and xip_elapsed_since.
Append .xiptext to the vectors when separate vectors are configured
because otherwise they are appended to the data and data may not even be
executable in XIP configuration.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2020-01-31 21:33:28 -08:00
parent 687eb3c42f
commit 03ce34cf8f
5 changed files with 34 additions and 1 deletions
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3
arch/xtensa/Kconfig
View File

@ -70,6 +70,9 @@ config ARCH_HAS_ILOG2_U32
config ARCH_HAS_ILOG2_U64
def_bool n
config ARCH_MTD_XIP
def_bool y
config NO_IOPORT_MAP
def_bool n

14
arch/xtensa/include/asm/mtd-xip.h Normal file
View File

@ -0,0 +1,14 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _ASM_MTD_XIP_H
#define _ASM_MTD_XIP_H
#include <asm/processor.h>
#define xip_irqpending() (xtensa_get_sr(interrupt) & xtensa_get_sr(intenable))
#define xip_currtime() (xtensa_get_sr(ccount))
#define xip_elapsed_since(x) ((xtensa_get_sr(ccount) - (x)) / 1000) /* should work up to 1GHz */
#define xip_cpu_idle() do { asm volatile ("waiti 0"); } while (0)
#endif /* _ASM_MTD_XIP_H */

4
arch/xtensa/include/asm/sections.h
View File

@ -34,6 +34,10 @@ extern char _SecondaryResetVector_text_start[];
extern char _SecondaryResetVector_text_end[];
#endif
#ifdef CONFIG_XIP_KERNEL
#ifdef CONFIG_VECTORS_ADDR
extern char _xip_text_start[];
extern char _xip_text_end[];
#endif
extern char _xip_start[];
extern char _xip_end[];
#endif

3
arch/xtensa/kernel/setup.c
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@ -311,6 +311,9 @@ void __init setup_arch(char **cmdline_p)
mem_reserve(__pa(_stext), __pa(_end));
#ifdef CONFIG_XIP_KERNEL
#ifdef CONFIG_VECTORS_ADDR
mem_reserve(__pa(_xip_text_start), __pa(_xip_text_end));
#endif
mem_reserve(__pa(_xip_start), __pa(_xip_end));
#endif

11
arch/xtensa/kernel/vmlinux.lds.S
View File

@ -118,6 +118,7 @@ SECTIONS
SECTION_VECTOR2 (.DoubleExceptionVector.text, DOUBLEEXC_VECTOR_VADDR)
*(.exception.text)
*(.xiptext)
#endif
IRQENTRY_TEXT
@ -201,6 +202,9 @@ SECTIONS
.DebugInterruptVector.text);
RELOCATE_ENTRY(_exception_text,
.exception.text);
#ifdef CONFIG_XIP_KERNEL
RELOCATE_ENTRY(_xip_text, .xiptext);
#endif
#endif
#ifdef CONFIG_XIP_KERNEL
RELOCATE_ENTRY(_xip_data, .data);
@ -319,7 +323,12 @@ SECTIONS
LAST)
#undef LAST
#define LAST .exception.text
SECTION_VECTOR4 (_xip_text,
.xiptext,
,
LAST)
#undef LAST
#define LAST .xiptext
#endif
. = (LOADADDR(LAST) + SIZEOF(LAST) + 3) & ~ 3;