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| author | H. Peter Anvin <hpa@zytor.com> | 2008-02-12 16:47:39 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2008-02-12 16:47:39 -0800 |
| commit | fc38cbecfcdb8237f22e8def62bced022260b035 (patch) | |
| tree | ec79fe5a5b9fe1fb75e52d86344a99acf9625e43 /com32/lib/syslinux/shuffle.c | |
| parent | 34baf2cd22bc9fad670d987aa84199f92a55f30a (diff) | |
| download | syslinux-fc38cbecfcdb8237f22e8def62bced022260b035.tar.gz | |
Query the shuffle descriptor set size and use it
Query the maximum number of shuffle descriptors, and use that number
as the descriptor block size.
Diffstat (limited to 'com32/lib/syslinux/shuffle.c')
| -rw-r--r-- | com32/lib/syslinux/shuffle.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/com32/lib/syslinux/shuffle.c b/com32/lib/syslinux/shuffle.c index dcb8d310..bb020a15 100644 --- a/com32/lib/syslinux/shuffle.c +++ b/com32/lib/syslinux/shuffle.c @@ -39,6 +39,7 @@ #include <com32.h> #include <minmax.h> #include <syslinux/movebits.h> +#include <klibc/compiler.h> #ifndef DEBUG # define DEBUG 0 @@ -54,8 +55,20 @@ struct shuffle_descriptor { uint32_t dst, src, len; }; +static int desc_block_size; + +static void __constructor __syslinux_get_desc_block_size(void) +{ + static com32sys_t reg; + + reg.eax.w[0] = 0x0011; + __intcall(0x22, ®, ®); + + desc_block_size = (reg.eflags.l & EFLAGS_CF) ? 256 : reg.ecx.w[0]; +} + /* Allocate descriptor memory in these chunks */ -#define DESC_BLOCK_SIZE 256 +#define DESC_BLOCK_SIZE desc_block_size int syslinux_prepare_shuffle(struct syslinux_movelist *fraglist, struct syslinux_memmap *memmap) |