diff options
author | hpa <hpa> | 2002-11-19 01:00:31 +0000 |
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committer | hpa <hpa> | 2002-11-19 01:00:31 +0000 |
commit | f0f0b20e336cfae8a83a5b22c4aa2cb90e01486b (patch) | |
tree | e39e7ac03fb244ff691b01cedde644f8f3d86834 /sample | |
parent | c66f5d626731683c046d113bb02063dbb81512d7 (diff) | |
download | syslinux-f0f0b20e336cfae8a83a5b22c4aa2cb90e01486b.tar.gz |
Add second hello world sample
Diffstat (limited to 'sample')
-rw-r--r-- | sample/Makefile | 2 | ||||
-rw-r--r-- | sample/hello2.c | 55 |
2 files changed, 56 insertions, 1 deletions
diff --git a/sample/Makefile b/sample/Makefile index 54fdb097..5626d131 100644 --- a/sample/Makefile +++ b/sample/Makefile @@ -25,7 +25,7 @@ PPMTOLSS16 = ../ppmtolss16 .SUFFIXES: .lss .c .o .elf .c32 -all: syslogo.lss hello.c32 +all: syslogo.lss hello.c32 hello2.c32 %.o: %.S $(CC) $(SFLAGS) -c -o $@ $< diff --git a/sample/hello2.c b/sample/hello2.c new file mode 100644 index 00000000..68dc6976 --- /dev/null +++ b/sample/hello2.c @@ -0,0 +1,55 @@ +#ident "$Id$" +/* ----------------------------------------------------------------------- * + * + * Copyright 2002 H. Peter Anvin - All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, Inc., 53 Temple Place Ste 330, + * Bostom MA 02111-1307, USA; either version 2 of the License, or + * (at your option) any later version; incorporated herein by reference. + * + * ----------------------------------------------------------------------- */ + +/* + * hello2.c + * + * Simple COM32 image + * + * This version shows how to use the bounce buffer for data transfer + * to the BIOS or COMBOOT system calls. + */ + +#include <com32.h> + +#define NULL ((void *)0) + +static inline void memset(void *buf, int ch, unsigned int len) +{ + asm volatile("cld; rep; stosb" + : "+D" (buf), "+c" (len) : "a" (ch) : "memory"); +} + +static inline void memcpy(void *dst, const void *src, unsigned int len) +{ + asm volatile("cld; rep; movsb" + : "+D" (dst), "+S" (src), "+c" (len) : : "memory"); +} + +int __start(void) +{ + const char msg[] = "Hello, World!\r\n"; + com32sys_t inreg, outreg; + const char *p; + + memset(&inreg, 0, sizeof inreg); + + /* Bounce buffer is at least 64K in size */ + memcpy(__com32.cs_bounce, msg, sizeof msg); + inreg.eax.w[0] = 0x0002; /* Write string */ + inreg.ebx.w[0] = OFFS(__com32.cs_bounce); + inreg.es = SEG(__com32.cs_bounce); + __com32.cs_syscall(0x22, &inreg, NULL); + + return 0; +} |