Change license from GPLv3 to LGPLv3.

[seabios.git] / src / util.c

diff --git a/src/util.c b/src/util.c
index 6b2d9dba44f536b1dc9f70e13af1938482503af6..af5dbd3376f5f3fc2dd175233282fda67ddffea1 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -1,4 +1,102 @@
+// Misc utility functions.
+//
+// Copyright (C) 2008  Kevin O'Connor <kevin@koconnor.net>
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+
 #include "util.h" // usleep
+#include "bregs.h" // struct bregs
+#include "config.h" // SEG_BIOS
+#include "farptr.h" // GET_FARPTR
+#include "biosvar.h" // get_ebda_seg
+
+// Call a function with a specified register state.  Note that on
+// return, the interrupt enable/disable flag may be altered.
+inline void
+call16(struct bregs *callregs)
+{
+    asm volatile(
+#if MODE16 == 1
+        "calll __call16\n"
+#else
+        "calll __call16_from32\n"
+#endif
+        : "+a" (callregs), "+m" (*callregs)
+        :
+        : "ebx", "ecx", "edx", "esi", "edi", "ebp", "cc", "memory");
+}
+
+inline void
+call16big(struct bregs *callregs)
+{
+    extern void __force_link_error__call16big_only_in_32bit_mode();
+    if (MODE16)
+        __force_link_error__call16big_only_in_32bit_mode();
+
+    asm volatile(
+        "calll __call16big_from32\n"
+        : "+a" (callregs), "+m" (*callregs)
+        :
+        : "ebx", "ecx", "edx", "esi", "edi", "ebp", "cc", "memory");
+}
+
+inline void
+__call16_int(struct bregs *callregs, u16 offset)
+{
+    callregs->cs = SEG_BIOS;
+    callregs->ip = offset;
+    call16(callregs);
+}
+
+inline void
+call16_simpint(int nr, u32 *eax, u32 *flags)
+{
+    extern void __force_link_error__call16_simpint_only_in_16bit_mode();
+    if (!MODE16)
+        __force_link_error__call16_simpint_only_in_16bit_mode();
+
+    asm volatile(
+        "stc\n"
+        "int %2\n"
+        "pushfl\n"
+        "popl %1\n"
+        "cld\n"
+        "cli\n"
+        : "+a"(*eax), "=r"(*flags)
+        : "i"(nr)
+        : "cc", "memory");
+}
+
+// Switch to the extra stack in ebda and call a function.
+inline u32
+stack_hop(u32 eax, u32 edx, u32 ecx, void *func)
+{
+    extern void __force_link_error__stack_hop_only_in_16bit_mode();
+    if (!MODE16)
+        __force_link_error__stack_hop_only_in_16bit_mode();
+
+    u32 ebda_seg = get_ebda_seg();
+    u32 tmp;
+    asm volatile(
+        // Backup current %ss value.
+        "movl %%ss, %4\n"
+        // Copy ebda seg to %ss and %ds
+        "movl %3, %%ss\n"
+        "movl %3, %%ds\n"
+        // Backup %esp and set it to new value
+        "movl %%esp, %3\n"
+        "movl %5, %%esp\n"
+        // Call func
+        "calll %6\n"
+        // Restore segments and stack
+        "movl %3, %%esp\n"
+        "movl %4, %%ss\n"
+        "movl %4, %%ds\n"
+        : "+a" (eax), "+d" (edx), "+c" (ecx), "+r" (ebda_seg), "=r" (tmp)
+        : "i" (EBDA_OFFSET_TOP_STACK), "m" (*(u8*)func)
+        : "cc", "memory");
+    return eax;
+}
 
 // Sum the bytes in the specified area.
 u8
@@ -20,7 +118,7 @@ memset(void *s, int c, size_t n)
 }
 
 void *
-memcpy(void *far_d1, const void *far_s1, size_t len)
+memcpy_far(void *far_d1, const void *far_s1, size_t len)
 {
     u8 *d = far_d1;
     u8 *s = (u8*)far_s1;
@@ -34,6 +132,15 @@ memcpy(void *far_d1, const void *far_s1, size_t len)
     return far_d1;
 }
 
+void *
+memcpy(void *d1, const void *s1, size_t len)
+{
+    u8 *d = (u8*)d1, *s = (u8*)s1;
+    while (len--)
+        *d++ = *s++;
+    return d1;
+}
+
 void *
 memmove(void *d, const void *s, size_t len)
 {
@@ -50,17 +157,3 @@ memmove(void *d, const void *s, size_t len)
 
     return d;
 }
-
-void
-__set_fail(const char *fname, struct bregs *regs)
-{
-    __debug_fail(fname, regs);
-    set_fail_silent(regs);
-}
-
-void
-__set_code_fail(const char *fname, struct bregs *regs, u8 code)
-{
-    __debug_fail(fname, regs);
-    set_code_fail_silent(regs, code);
-}