ramoops
ramoops dts mem buffer IO map
ramoops_probe ramoops_init_prz persistent_ram_new persistent_ram_buffer_map
fs/pstore/ram_core.c
static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
struct persistent_ram_zone *prz, int memtype)
{
prz->paddr = start;
prz->size = size;
if (pfn_valid(start >> PAGE_SHIFT))
prz->vaddr = persistent_ram_vmap(start, size, memtype);
else
prz->vaddr = persistent_ram_iomap(start, size, memtype,
prz->label);
if (!prz->vaddr) {
pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__,
(unsigned long long)size, (unsigned long long)start);
return -ENOMEM;
}
prz->buffer = prz->vaddr;
prz->buffer_size = size - sizeof(struct persistent_ram_buffer);
return 0;
}
写console log到console IO mem buffer
__memcpy_toio+0x18/0x6c persistent_ram_update+0x44/0x12c persistent_ram_write+0x1a8/0x1b8 ramoops_pstore_write+0x198/0x1e8 pstore_console_write+0x90/0xdc console_unlock+0x3b0/0x5c0 vprintk_emit+0x184/0x238 vprintk_default+0x48/0x70 vprintk_func+0x1bc/0x1f8 printk+0x54/0x7c wakeup_source_activate+0xa4/0x1e0
标签：buffer,ram,persistent,prz,ramoops,size From： https://www.cnblogs.com/aspirs/p/17081921.html