diff options
| author | Guo Ren <ren_guo@c-sky.com> | 2019-04-12 13:08:34 +0200 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2019-04-22 07:44:57 +0200 |
| commit | 205353fa06cc5dbfe1949de013ba905bb151c702 (patch) | |
| tree | a51d0bfb604e0794aa6a1665794e5fa98e3bdd1d /arch/csky/kernel | |
| parent | csky: Add perf_arch_fetch_caller_regs support (diff) | |
| download | linux-205353fa06cc5dbfe1949de013ba905bb151c702.tar.xz linux-205353fa06cc5dbfe1949de013ba905bb151c702.zip | |
csky: Support vmlinux bootup with MMU off
Modify SETUP_MMU macro to fit on both MMU-on or MMU-off enviornment
and vmlinux could bootup from MMU off enviornment for some cases.
Unify the style of _start and _start_smp_secondary in head.S to make
head.S looks more concise and easy to understand.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky/kernel')
| -rw-r--r-- | arch/csky/kernel/head.S | 60 | ||||
| -rw-r--r-- | arch/csky/kernel/setup.c | 7 |
2 files changed, 11 insertions, 56 deletions
diff --git a/arch/csky/kernel/head.S b/arch/csky/kernel/head.S index 9c4ec473b76b..61989f9241c0 100644 --- a/arch/csky/kernel/head.S +++ b/arch/csky/kernel/head.S @@ -7,16 +7,11 @@ __HEAD ENTRY(_start) - /* set super user mode */ - lrw a3, DEFAULT_PSR_VALUE - mtcr a3, psr - psrset ee - - SETUP_MMU a3 + SETUP_MMU /* set stack point */ - lrw a3, init_thread_union + THREAD_SIZE - mov sp, a3 + lrw r6, init_thread_union + THREAD_SIZE + mov sp, r6 jmpi csky_start END(_start) @@ -24,53 +19,12 @@ END(_start) #ifdef CONFIG_SMP .align 10 ENTRY(_start_smp_secondary) - /* Invalid I/Dcache BTB BHT */ - movi a3, 7 - lsli a3, 16 - addi a3, (1<<4) | 3 - mtcr a3, cr17 - - tlbi.alls - - /* setup PAGEMASK */ - movi a3, 0 - mtcr a3, cr<6, 15> - - /* setup MEL0/MEL1 */ - grs a0, _start_smp_pc -_start_smp_pc: - bmaski a1, 13 - andn a0, a1 - movi a1, 0x00000006 - movi a2, 0x00001006 - or a1, a0 - or a2, a0 - mtcr a1, cr<2, 15> - mtcr a2, cr<3, 15> - - /* setup MEH */ - mtcr a0, cr<4, 15> - - /* write TLB */ - bgeni a3, 28 - mtcr a3, cr<8, 15> - - SETUP_MMU a3 - - /* enable MMU */ - movi a3, 1 - mtcr a3, cr18 - - jmpi _goto_mmu_on -_goto_mmu_on: - lrw a3, DEFAULT_PSR_VALUE - mtcr a3, psr - psrset ee + SETUP_MMU /* set stack point */ - lrw a3, secondary_stack - ld.w a3, (a3, 0) - mov sp, a3 + lrw r6, secondary_stack + ld.w r6, (r6, 0) + mov sp, r6 jmpi csky_start_secondary END(_start_smp_secondary) diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c index c377194e4b8f..36fc04b9417d 100644 --- a/arch/csky/kernel/setup.c +++ b/arch/csky/kernel/setup.c @@ -145,7 +145,8 @@ void __init setup_arch(char **cmdline_p) unsigned long phys_offset; EXPORT_SYMBOL(phys_offset); -asmlinkage __visible void __init csky_start(unsigned int unused, void *param) +asmlinkage __visible void __init csky_start(unsigned int unused, + void *dtb_start) { /* Clean up bss section */ memset(__bss_start, 0, __bss_stop - __bss_start); @@ -155,10 +156,10 @@ asmlinkage __visible void __init csky_start(unsigned int unused, void *param) pre_trap_init(); pre_mmu_init(); - if (param == NULL) + if (dtb_start == NULL) early_init_dt_scan(__dtb_start); else - early_init_dt_scan(param); + early_init_dt_scan(dtb_start); start_kernel(); |