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authorFeng Tang <feng.tang@intel.com>2010-07-14 10:57:18 +0800
committerFeng Tang <feng.tang@intel.com>2010-07-20 11:10:04 +0800
commit3400a8754214f4cd69d49d85c0396665d7a6415f (patch)
tree8e6218d779196123eb368b136d91ae55ad2bc418 /com32/lib/sys/farcall.c
parent967eb65904c0de527fccee529187bf0dcb4af989 (diff)
downloadsyslinux-3400a8754214f4cd69d49d85c0396665d7a6415f.tar.gz
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elflink: add more change as show below
com32/lib/chdir.c com32/lib/getcwd.c com32/lib/getopt.c com32/lib/pci/scan.c com32/lib/sys/farcall.c com32/lib/sys/times.c com32/lib/sys/vesa/background.c com32/lib/sys/vesa/screencpy.c com32/lib/vdprintf.c com32/rosh/rosh.c com32/rosh/rosh.h com32/sysdump/backend.h com32/sysdump/be_tftp.c com32/sysdump/main.c com32/sysdump/memmap.c com32/sysdump/sysdump.h com32/sysdump/vesa.c doc/comboot.txt doc/extlinux.txt doc/gpt.txt doc/memdisk.txt doc/menu.txt doc/syslinux.txt
Diffstat (limited to 'com32/lib/sys/farcall.c')
-rw-r--r--com32/lib/sys/farcall.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/com32/lib/sys/farcall.c b/com32/lib/sys/farcall.c
index 7d195f10..988ee6d2 100644
--- a/com32/lib/sys/farcall.c
+++ b/com32/lib/sys/farcall.c
@@ -4,8 +4,21 @@
#include <com32.h>
+static inline uint32_t eflags(void)
+{
+ uint32_t v;
+
+ asm volatile("pushfl ; popl %0" : "=rm" (v));
+ return v;
+}
+
void __farcall(uint16_t cs, uint16_t ip,
const com32sys_t * ireg, com32sys_t * oreg)
{
- __com32.cs_farcall((cs << 16) + ip, ireg, oreg);
+ com32sys_t xreg = *ireg;
+
+ /* Enable interrupts if and only if they are enabled in the caller */
+ xreg.eflags.l = (xreg.eflags.l & ~EFLAGS_IF) | (eflags() & EFLAGS_IF);
+
+ __com32.cs_farcall((cs << 16) + ip, &xreg, oreg);
}