The following patch adds another test function, 'hello_world' to the 32 bit functions. The intention is to show what needs to be done to support one more function call -- not much. This and the already-existing test function are then called from handle_1a in 16 bit space.
After enabling the debugging output, the following then becomes visible:
handle_1a at 0x00008356 Calling hello world Hello world at 0x7ffe48f3 test at 0x7ffe4905 a=7,b=8,c=9,d=10,e=11,f=12 Result from upcall res=56
The result 'res' is the result of a*b.
Signed-off-by: Stefan Berger stefanb@us.ibm.com
--- src/clock.c | 5 +++++ src/upcall.c | 5 +++++ 2 files changed, 10 insertions(+)
Index: seabios/src/clock.c =================================================================== --- seabios.orig/src/clock.c +++ seabios/src/clock.c @@ -13,6 +13,7 @@ #include "bregs.h" // struct bregs #include "biosvar.h" // GET_GLOBAL #include "usb-hid.h" // usb_check_event +#include "upcall.h"
// RTC register flags #define RTC_A_UIP 0x80 @@ -445,6 +446,10 @@ handle_1aXX(struct bregs *regs) void VISIBLE16 handle_1a(struct bregs *regs) { +dprintf(1, "handle_1a at %p\n", handle_1a); +dprintf(1,"Calling hello world\n"); +hello_world(); +dprintf(1,"Result from upcall res=%d\n", test_highbios(7,8,9,10,11,12)); debug_enter(regs, DEBUG_HDL_1a); switch (regs->ah) { case 0x00: handle_1a00(regs); break; Index: seabios/src/upcall.c =================================================================== --- seabios.orig/src/upcall.c +++ seabios/src/upcall.c @@ -11,6 +11,11 @@ test_highbios(u8 a, u16 b, u32 c, u8 d, return a*b; }
+void +hello_world(void) +{ + dprintf(1,"Hello world at %p\n", hello_world); +}
#define FUNC(IDX, NUMPARMS, RETTYPE, NAME, PARMS ...) \ [IDX] = NAME, Index: seabios/src/upcall_protos.h =================================================================== --- seabios.orig/src/upcall_protos.h +++ seabios/src/upcall_protos.h @@ -6,7 +6,9 @@ /* all function names below must be expanded with _upcall */
# define test_highbios test_highbios_upcall +# define hello_world hello_world_upcall
#endif
FUNC(0, 6, int , test_highbios, u8 a, u16 b, u32 c,u8 d, u16 e, int f) +FUNC(1, 0, void, hello_world , void) \ No newline at end of file
-
Stefan Berger