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| author | Johannes Weiner <jw@emlix.com> | 2009-03-04 16:21:31 +0100 |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2009-04-02 23:41:50 -0700 |
| commit | e5083a63b6a8546c5fe1e571fe529e3939787ec2 (patch) | |
| tree | 5c11db5b0a924f8bcfc404c202630d37ccfd7c3c /arch/xtensa/kernel | |
| parent | 7789f89af9e8e426d7a7f173cf465a4fcadba7dd (diff) | |
| download | linux-e5083a63b6a8546c5fe1e571fe529e3939787ec2.tar.gz linux-e5083a63b6a8546c5fe1e571fe529e3939787ec2.tar.bz2 linux-e5083a63b6a8546c5fe1e571fe529e3939787ec2.zip | |
xtensa: nommu support
Add support for !CONFIG_MMU setups.
Signed-off-by: Johannes Weiner <jw@emlix.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa/kernel')
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 3 | ||||
| -rw-r--r-- | arch/xtensa/kernel/head.S | 3 | ||||
| -rw-r--r-- | arch/xtensa/kernel/setup.c | 7 | ||||
| -rw-r--r-- | arch/xtensa/kernel/traps.c | 2 | ||||
| -rw-r--r-- | arch/xtensa/kernel/vectors.S | 4 |
5 files changed, 17 insertions, 2 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index a51d36a27389..80d24c485fd3 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -1463,6 +1463,7 @@ ENTRY(_spill_registers) callx0 a0 # should not return 1: j 1b +#ifdef CONFIG_MMU /* * We should never get here. Bail out! */ @@ -1775,7 +1776,7 @@ ENTRY(fast_store_prohibited) bbsi.l a2, PS_UM_BIT, 1f j _kernel_exception 1: j _user_exception - +#endif /* CONFIG_MMU */ /* * System Calls. diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S index 67e69139520b..d092c225d5b7 100644 --- a/arch/xtensa/kernel/head.S +++ b/arch/xtensa/kernel/head.S @@ -235,8 +235,9 @@ should_never_return: */ .section ".bss.page_aligned", "w" +#ifdef CONFIG_MMU ENTRY(swapper_pg_dir) .fill PAGE_SIZE, 1, 0 +#endif ENTRY(empty_zero_page) .fill PAGE_SIZE, 1, 0 - diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c index 4ec1633c2941..1e5a034fe011 100644 --- a/arch/xtensa/kernel/setup.c +++ b/arch/xtensa/kernel/setup.c @@ -84,7 +84,13 @@ sysmem_info_t __initdata sysmem; int initrd_is_mapped; #endif +#ifdef CONFIG_MMU extern void init_mmu(void); +#else +static inline void init_mmu(void) { } +#endif + +extern void zones_init(void); /* * Boot parameter parsing. @@ -286,6 +292,7 @@ void __init setup_arch(char **cmdline_p) paging_init(); + zones_init(); #ifdef CONFIG_VT # if defined(CONFIG_VGA_CONSOLE) diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 6b4a9d79e7be..9f0b71189e94 100644 --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -104,6 +104,7 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = { #endif { EXCCAUSE_UNALIGNED, KRNL, fast_unaligned }, #endif +#ifdef CONFIG_MMU { EXCCAUSE_ITLB_MISS, 0, do_page_fault }, { EXCCAUSE_ITLB_MISS, USER|KRNL, fast_second_level_miss}, { EXCCAUSE_ITLB_MULTIHIT, 0, do_multihit }, @@ -118,6 +119,7 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = { { EXCCAUSE_STORE_CACHE_ATTRIBUTE, USER|KRNL, fast_store_prohibited }, { EXCCAUSE_STORE_CACHE_ATTRIBUTE, 0, do_page_fault }, { EXCCAUSE_LOAD_CACHE_ATTRIBUTE, 0, do_page_fault }, +#endif /* CONFIG_MMU */ /* XCCHAL_EXCCAUSE_FLOATING_POINT unhandled */ #if XTENSA_HAVE_COPROCESSOR(0) COPROCESSOR(0), diff --git a/arch/xtensa/kernel/vectors.S b/arch/xtensa/kernel/vectors.S index eb2d7bb69ee0..74a7518faf16 100644 --- a/arch/xtensa/kernel/vectors.S +++ b/arch/xtensa/kernel/vectors.S @@ -309,6 +309,7 @@ ENTRY(_DoubleExceptionVector) * All other exceptions are unexpected and thus unrecoverable! */ +#ifdef CONFIG_MMU .extern fast_second_level_miss_double_kernel .Lksp: /* a0: a0, a1: a1, a2: a2, a3: trashed, depc: depc, excsave: a3 */ @@ -319,6 +320,9 @@ ENTRY(_DoubleExceptionVector) bnez a3, .Lunrecoverable 1: movi a3, fast_second_level_miss_double_kernel jx a3 +#else +.equ .Lksp, .Lunrecoverable +#endif /* Critical! We can't handle this situation. PANIC! */ |