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ARM: zynq: Not to rewrite jump code when starting address is 0x0 

This configuration is used by remoteproc.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2013-05-24 17:58:55 +02:00
parent 7ac161c435
commit 88cd4e882d
1 changed files with 26 additions and 26 deletions
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52
arch/arm/mach-zynq/platsmp.c
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@ -53,34 +53,34 @@ int __cpuinit zynq_cpun_start(u32 address, int cpu)
&zynq_secondary_trampoline; &zynq_secondary_trampoline;
zynq_slcr_cpu_stop(cpu); zynq_slcr_cpu_stop(cpu);
if (address) {
if (__pa(PAGE_OFFSET)) { if (__pa(PAGE_OFFSET)) {
zero = ioremap(0, trampoline_code_size); zero = ioremap(0, trampoline_code_size);
if (!zero) { if (!zero) {
pr_warn("BOOTUP jump vectors not accessible\n"); pr_warn("BOOTUP jump vectors not accessible\n");
return -1; return -1;
}
} else {
zero = (__force u8 __iomem *)PAGE_OFFSET;
} }
} else {
zero = (__force u8 __iomem *)PAGE_OFFSET; /*
* This is elegant way how to jump to any address
* 0x0: Load address at 0x8 to r0
* 0x4: Jump by mov instruction
* 0x8: Jumping address
*/
memcpy((__force void *)zero, &zynq_secondary_trampoline,
trampoline_size);
writel(address, zero + trampoline_size);
flush_cache_all();
outer_flush_range(0, trampoline_code_size);
smp_wmb();
if (__pa(PAGE_OFFSET))
iounmap(zero);
} }
/*
* This is elegant way how to jump to any address
* 0x0: Load address at 0x8 to r0
* 0x4: Jump by mov instruction
* 0x8: Jumping address
*/
memcpy((__force void *)zero, &zynq_secondary_trampoline,
trampoline_size);
writel(address, zero + trampoline_size);
flush_cache_all();
outer_flush_range(0, trampoline_code_size);
smp_wmb();
if (__pa(PAGE_OFFSET))
iounmap(zero);
zynq_slcr_cpu_start(cpu); zynq_slcr_cpu_start(cpu);
return 0; return 0;