[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2] xen: arm: introduce uImage probe function for Dom0
Patch adds a possibility to boot dom0 kernel from uImage. This is needed to improve boot-time. Comparing to zImage, uImage is not packed, therefore we can save time needed to unpack. Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx> --- Changed since v1: * fixed commit message * added uimage structure definition * removed checking of the append device tree xen/arch/arm/kernel.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/xen/arch/arm/kernel.c b/xen/arch/arm/kernel.c index d635a7e..20e6884 100644 --- a/xen/arch/arm/kernel.c +++ b/xen/arch/arm/kernel.c @@ -16,6 +16,9 @@ #include "kernel.h" +#define UIMAGE32_MAGIC 0x27051956 +#define UIMAGE32_NMLEN 32 + #define ZIMAGE32_MAGIC_OFFSET 0x24 #define ZIMAGE32_START_OFFSET 0x28 #define ZIMAGE32_END_OFFSET 0x2c @@ -188,6 +191,64 @@ static void kernel_zimage_load(struct kernel_info *info) } } +/* + * Check if the image is a 32-bit uImage and setup kernel_info + */ +static int kernel_uimage32_probe(struct kernel_info *info, + paddr_t addr, paddr_t size) +{ + struct { + __be32 magic; /* Image Header Magic Number */ + __be32 hcrc; /* Image Header CRC Checksum */ + __be32 time; /* Image Creation Timestamp */ + __be32 size; /* Image Data Size */ + __be32 load; /* Data Load Address */ + __be32 ep; /* Entry Point Address */ + __be32 dcrc; /* Image Data CRC Checksum */ + uint8_t os; /* Operating System */ + uint8_t arch; /* CPU architecture */ + uint8_t type; /* Image Type */ + uint8_t comp; /* Compression Type */ + uint8_t name[UIMAGE32_NMLEN]; /* Image Name */ + } uimage; + + uint32_t start, len; + + if ( size < sizeof(uimage) ) + return -EINVAL; + + copy_from_paddr(&uimage, addr, sizeof(uimage)); + + if ( be32_to_cpu(uimage.magic) != UIMAGE32_MAGIC ) + return -EINVAL; + + start = be32_to_cpu(uimage.load); + len = be32_to_cpu(uimage.size); + + if ( len > size ) + return -EINVAL; + + /* + * If start is sizeof(zimage) zImage is position independent -- load it + * at 32k from start of RAM. + */ + if ( start == 0 ) + info->zimage.start = info->mem.bank[0].start + 0x8000; + else + info->zimage.start = start; + + info->zimage.kernel_addr = addr + sizeof(uimage); + info->zimage.len = len; + info->entry = info->zimage.start; + info->load = kernel_zimage_load; + +#ifdef CONFIG_ARM_64 + info->type = DOMAIN_32BIT; +#endif + + return 0; +} + #ifdef CONFIG_ARM_64 /* * Check if the image is a 64-bit Image. @@ -398,6 +459,8 @@ int kernel_probe(struct kernel_info *info) rc = kernel_zimage64_probe(info, start, size); if (rc < 0) #endif + rc = kernel_uimage32_probe(info, start, size); + if(rc < 0 ) rc = kernel_zimage32_probe(info, start, size); if (rc < 0) rc = kernel_elf_probe(info, start, size); -- 1.9.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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