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| author | Max Filippov <jcmvbkbc@gmail.com> | 2017-01-03 17:57:51 -0800 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2019-11-26 11:33:38 -0800 |
| commit | 7af710d988775aadf440222ecbe0c10eecf3eb54 (patch) | |
| tree | f499a51c705441d0aa2019ef88f13e8598627b92 /arch/xtensa/kernel/setup.c | |
| parent | 76743c0e0915af6ae1d960c14e8c1dcb3e238f23 (diff) | |
| download | linux-7af710d988775aadf440222ecbe0c10eecf3eb54.tar.gz linux-7af710d988775aadf440222ecbe0c10eecf3eb54.tar.bz2 linux-7af710d988775aadf440222ecbe0c10eecf3eb54.zip | |
xtensa: add XIP kernel support
XIP (eXecute In Place) kernel image is the image that can be run
directly from ROM, using RAM only for writable data.
XIP xtensa kernel differs from regular xtensa kernel in the following
ways:
- it has exception/IRQ vectors merged into text section. No vectors
relocation takes place at kernel startup.
- .data/.bss location must be specified in the kernel configuration,
its content is copied there in the _startup function.
- .init.text is merged with the rest of text and is executed from ROM.
- when MMU is used the virtual address where the kernel will be mapped
must be specified in the kernel configuration. It may be in the KSEG
or in the KIO, __pa macro is adjusted to be able to handle both.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/setup.c')
| -rw-r--r-- | arch/xtensa/kernel/setup.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c index e0e1e1892b86..0f93b67c7a5a 100644 --- a/arch/xtensa/kernel/setup.c +++ b/arch/xtensa/kernel/setup.c @@ -308,6 +308,10 @@ extern char _Level6InterruptVector_text_end; extern char _SecondaryResetVector_text_start; extern char _SecondaryResetVector_text_end; #endif +#ifdef CONFIG_XIP_KERNEL +extern char _xip_start[]; +extern char _xip_end[]; +#endif static inline int __init_memblock mem_reserve(unsigned long start, unsigned long end) @@ -339,6 +343,9 @@ void __init setup_arch(char **cmdline_p) #endif mem_reserve(__pa(_stext), __pa(_end)); +#ifdef CONFIG_XIP_KERNEL + mem_reserve(__pa(_xip_start), __pa(_xip_end)); +#endif #ifdef CONFIG_VECTORS_OFFSET mem_reserve(__pa(&_WindowVectors_text_start), |