diff options
| 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/head.S | |
| parent | 76743c0e0915af6ae1d960c14e8c1dcb3e238f23 (diff) | |
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/head.S')
| -rw-r--r-- | arch/xtensa/kernel/head.S | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S index 2cec13a457d7..e0c1fac0910f 100644 --- a/arch/xtensa/kernel/head.S +++ b/arch/xtensa/kernel/head.S @@ -260,6 +260,13 @@ ENTRY(_startup) ___invalidate_icache_all a2 a3 isync +#ifdef CONFIG_XIP_KERNEL + /* Setup bootstrap CPU stack in XIP kernel */ + + movi a1, start_info + l32i a1, a1, 0 +#endif + movi a6, 0 xsr a6, excsave1 |