diff options
| author | Guo Ren <ren_guo@c-sky.com> | 2019-04-12 14:08:34 +0300 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2019-04-22 08:44:57 +0300 |
| commit | 205353fa06cc5dbfe1949de013ba905bb151c702 (patch) | |
| tree | a51d0bfb604e0794aa6a1665794e5fa98e3bdd1d /arch/csky/abiv2 | |
| parent | b4bf274198bd415e66af0b54a2e181c59fd43ba4 (diff) | |
| download | linux-205353fa06cc5dbfe1949de013ba905bb151c702.tar.xz | |
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/abiv2')
| -rw-r--r-- | arch/csky/abiv2/inc/abi/entry.h | 79 |
1 files changed, 62 insertions, 17 deletions
diff --git a/arch/csky/abiv2/inc/abi/entry.h b/arch/csky/abiv2/inc/abi/entry.h index c0a76c43cded..9897a16b45e5 100644 --- a/arch/csky/abiv2/inc/abi/entry.h +++ b/arch/csky/abiv2/inc/abi/entry.h @@ -162,31 +162,76 @@ mtcr \rx, cr<8, 15> .endm -.macro SETUP_MMU rx - /* Check MMU on | off */ - mfcr \rx, cr18 - btsti \rx, 0 +.macro SETUP_MMU + /* Init psr and enable ee */ + lrw r6, DEFAULT_PSR_VALUE + mtcr r6, psr + psrset ee + + /* Invalid I/Dcache BTB BHT */ + movi r6, 7 + lsli r6, 16 + addi r6, (1<<4) | 3 + mtcr r6, cr17 + + /* Invalid all TLB */ + bgeni r6, 26 + mtcr r6, cr<8, 15> /* Set MCIR */ + + /* Check MMU on/off */ + mfcr r6, cr18 + btsti r6, 0 bt 1f - grs \rx, 1f + + /* MMU off: setup mapping tlb entry */ + movi r6, 0 + mtcr r6, cr<6, 15> /* Set MPR with 4K page size */ + + grs r6, 1f /* Get current pa by PC */ + bmaski r7, (PAGE_SHIFT + 1) /* r7 = 0x1fff */ + andn r6, r7 + mtcr r6, cr<4, 15> /* Set MEH */ + + mov r8, r6 + movi r7, 0x00000006 + or r8, r7 + mtcr r8, cr<2, 15> /* Set MEL0 */ + movi r7, 0x00001006 + or r8, r7 + mtcr r8, cr<3, 15> /* Set MEL1 */ + + bgeni r8, 28 + mtcr r8, cr<8, 15> /* Set MCIR to write TLB */ + br 2f 1: /* - * cr<30, 15> format: + * MMU on: use origin MSA value from bootloader + * + * cr<30/31, 15> MSA register format: * 31 - 29 | 28 - 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 * BA Reserved SH WA B SO SEC C D V */ - mfcr \rx, cr<30, 15> + mfcr r6, cr<30, 15> /* Get MSA0 */ 2: - lsri \rx, 28 - lsli \rx, 28 - addi \rx, 0x1ce - mtcr \rx, cr<30, 15> - - lsri \rx, 28 - addi \rx, 2 - lsli \rx, 28 - addi \rx, 0x1ce - mtcr \rx, cr<31, 15> + lsri r6, 28 + lsli r6, 28 + addi r6, 0x1ce + mtcr r6, cr<30, 15> /* Set MSA0 */ + + lsri r6, 28 + addi r6, 2 + lsli r6, 28 + addi r6, 0x1ce + mtcr r6, cr<31, 15> /* Set MSA1 */ + + /* enable MMU */ + mfcr r6, cr18 + bseti r6, 0 + mtcr r6, cr18 + + jmpi 3f /* jump to va */ +3: .endm .macro ANDI_R3 rx, imm |