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author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2021-01-15 13:46:04 +0800 |
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committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2021-02-18 23:17:57 -0800 |
commit | c72160fe05fb978ad859ba053c4462c2bb960b13 (patch) | |
tree | 7e049e02369f5e4d78f2c9f3cfe24a89163d8b72 /init/initramfs.c | |
parent | fade5cad9339a627c5ad029e3577582b6292df03 (diff) | |
download | linux-c72160fe05fb978ad859ba053c4462c2bb960b13.tar.bz2 |
initramfs: Provide a common initrd reserve function
Some architectures(eg, ARM and riscv) have similar logic to
check and reserve the memory of initrd, let's provide a common
function reserve_initrd_mem() to reduce duplicated code.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'init/initramfs.c')
-rw-r--r-- | init/initramfs.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/init/initramfs.c b/init/initramfs.c index 55b74d7e5260..f75c89e9d602 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -535,6 +535,51 @@ extern unsigned long __initramfs_size; #include <linux/initrd.h> #include <linux/kexec.h> +void __init reserve_initrd_mem(void) +{ + phys_addr_t start; + unsigned long size; + + /* Ignore the virtul address computed during device tree parsing */ + initrd_start = initrd_end = 0; + + if (!phys_initrd_size) + return; + /* + * Round the memory region to page boundaries as per free_initrd_mem() + * This allows us to detect whether the pages overlapping the initrd + * are in use, but more importantly, reserves the entire set of pages + * as we don't want these pages allocated for other purposes. + */ + start = round_down(phys_initrd_start, PAGE_SIZE); + size = phys_initrd_size + (phys_initrd_start - start); + size = round_up(size, PAGE_SIZE); + + if (!memblock_is_region_memory(start, size)) { + pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region", + (u64)start, size); + goto disable; + } + + if (memblock_is_region_reserved(start, size)) { + pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n", + (u64)start, size); + goto disable; + } + + memblock_reserve(start, size); + /* Now convert initrd to virtual addresses */ + initrd_start = (unsigned long)__va(phys_initrd_start); + initrd_end = initrd_start + phys_initrd_size; + initrd_below_start_ok = 1; + + return; +disable: + pr_cont(" - disabling initrd\n"); + initrd_start = 0; + initrd_end = 0; +} + void __weak __init free_initrd_mem(unsigned long start, unsigned long end) { #ifdef CONFIG_ARCH_KEEP_MEMBLOCK |