| #include <linux/linkage.h> |
| #include <linux/init.h> |
| |
| .section ".text.head", "ax" |
| __CPUINIT |
| |
| /* |
| * Tegra specific entry point for secondary CPUs. |
| * The secondary kernel init calls v7_flush_dcache_all before it enables |
| * the L1; however, the L1 comes out of reset in an undefined state, so |
| * the clean + invalidate performed by v7_flush_dcache_all causes a bunch |
| * of cache lines with uninitialized data and uninitialized tags to get |
| * written out to memory, which does really unpleasant things to the main |
| * processor. We fix this by performing an invalidate, rather than a |
| * clean + invalidate, before jumping into the kernel. |
| */ |
| ENTRY(v7_invalidate_l1) |
| mov r0, #0 |
| mcr p15, 2, r0, c0, c0, 0 |
| mrc p15, 1, r0, c0, c0, 0 |
| |
| ldr r1, =0x7fff |
| and r2, r1, r0, lsr #13 |
| |
| ldr r1, =0x3ff |
| |
| and r3, r1, r0, lsr #3 @ NumWays - 1 |
| add r2, r2, #1 @ NumSets |
| |
| and r0, r0, #0x7 |
| add r0, r0, #4 @ SetShift |
| |
| clz r1, r3 @ WayShift |
| add r4, r3, #1 @ NumWays |
| 1: sub r2, r2, #1 @ NumSets-- |
| mov r3, r4 @ Temp = NumWays |
| 2: subs r3, r3, #1 @ Temp-- |
| mov r5, r3, lsl r1 |
| mov r6, r2, lsl r0 |
| orr r5, r5, r6 @ Reg = (Temp<<WayShift)|(NumSets<<SetShift) |
| mcr p15, 0, r5, c7, c6, 2 |
| bgt 2b |
| cmp r2, #0 |
| bgt 1b |
| dsb |
| isb |
| mov pc, lr |
| ENDPROC(v7_invalidate_l1) |
| |
| ENTRY(tegra_secondary_startup) |
| msr cpsr_fsxc, #0xd3 |
| bl v7_invalidate_l1 |
| mrc p15, 0, r0, c0, c0, 5 |
| and r0, r0, #15 |
| ldr r1, =0x6000f100 |
| str r0, [r1] |
| 1: ldr r2, [r1] |
| cmp r0, r2 |
| beq 1b |
| b secondary_startup |
| ENDPROC(tegra_secondary_startup) |
