projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 9143a935 GR |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | ||
| 3 | #include <linux/linkage.h> | |
| 4 | #include <linux/init.h> | |
| 5 | #include <asm/page.h> | |
| 6 | #include <abi/entry.h> | |
| 7 | ||
| 8 | __HEAD | |
| 9 | ENTRY(_start) | |
| 10 | /* set super user mode */ | |
| 11 | lrw a3, DEFAULT_PSR_VALUE | |
| 12 | mtcr a3, psr | |
| 13 | psrset ee | |
| 14 | ||
| 15 | SETUP_MMU a3 | |
| 16 | ||
| 17 | /* set stack point */ | |
| 18 | lrw a3, init_thread_union + THREAD_SIZE | |
| 19 | mov sp, a3 | |
| 20 | ||
| 21 | jmpi csky_start | |
| 22 | END(_start) | |
| 23 | ||
| 24 | #ifdef CONFIG_SMP | |
| 25 | .align 10 | |
| 26 | ENTRY(_start_smp_secondary) | |
| 27 | /* Invalid I/Dcache BTB BHT */ | |
| 28 | movi a3, 7 | |
| 29 | lsli a3, 16 | |
| 30 | addi a3, (1<<4) | 3 | |
| 31 | mtcr a3, cr17 | |
| 32 | ||
| 33 | tlbi.alls | |
| 34 | ||
| 35 | /* setup PAGEMASK */ | |
| 36 | movi a3, 0 | |
| 37 | mtcr a3, cr<6, 15> | |
| 38 | ||
| 39 | /* setup MEL0/MEL1 */ | |
| 40 | grs a0, _start_smp_pc | |
| 41 | _start_smp_pc: | |
| 42 | bmaski a1, 13 | |
| 43 | andn a0, a1 | |
| 44 | movi a1, 0x00000006 | |
| 45 | movi a2, 0x00001006 | |
| 46 | or a1, a0 | |
| 47 | or a2, a0 | |
| 48 | mtcr a1, cr<2, 15> | |
| 49 | mtcr a2, cr<3, 15> | |
| 50 | ||
| 51 | /* setup MEH */ | |
| 52 | mtcr a0, cr<4, 15> | |
| 53 | ||
| 54 | /* write TLB */ | |
| 55 | bgeni a3, 28 | |
| 56 | mtcr a3, cr<8, 15> | |
| 57 | ||
| 58 | SETUP_MMU a3 | |
| 59 | ||
| 60 | /* enable MMU */ | |
| 61 | movi a3, 1 | |
| 62 | mtcr a3, cr18 | |
| 63 | ||
| 64 | jmpi _goto_mmu_on | |
| 65 | _goto_mmu_on: | |
| 66 | lrw a3, DEFAULT_PSR_VALUE | |
| 67 | mtcr a3, psr | |
| 68 | psrset ee | |
| 69 | ||
| 70 | /* set stack point */ | |
| 71 | lrw a3, secondary_stack | |
| 72 | ld.w a3, (a3, 0) | |
| 73 | mov sp, a3 | |
| 74 | ||
| 75 | jmpi csky_start_secondary | |
| 76 | END(_start_smp_secondary) | |
| 77 | #endif |