-#include "util.h" // usleep
+// Misc utility functions.
+//
+// Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net>
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+
+#include "util.h" // call16
+#include "bregs.h" // struct bregs
+#include "farptr.h" // GET_FLATPTR
+#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"
+ "cli\n"
+ "cld"
+#else
+ "calll __call16_from32"
+#endif
+ : "+a" (callregs), "+m" (*callregs)
+ :
+ : "ebx", "ecx", "edx", "esi", "edi", "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"
+ : "+a" (callregs), "+m" (*callregs)
+ :
+ : "ebx", "ecx", "edx", "esi", "edi", "cc", "memory");
+}
+
+inline void
+__call16_int(struct bregs *callregs, u16 offset)
+{
+ if (MODE16)
+ callregs->cs = GET_SEG(CS);
+ else
+ callregs->cs = SEG_BIOS;
+ callregs->ip = offset;
+ call16(callregs);
+}
+
+// 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();
+
+ u16 ebda_seg = get_ebda_seg(), bkup_ss;
+ u32 bkup_esp;
+ asm volatile(
+ // Backup current %ss/%esp values.
+ "movw %%ss, %w3\n"
+ "movl %%esp, %4\n"
+ // Copy ebda seg to %ds/%ss and set %esp
+ "movw %w6, %%ds\n"
+ "movw %w6, %%ss\n"
+ "movl %5, %%esp\n"
+ // Call func
+ "calll %7\n"
+ // Restore segments and stack
+ "movw %w3, %%ds\n"
+ "movw %w3, %%ss\n"
+ "movl %4, %%esp"
+ : "+a" (eax), "+d" (edx), "+c" (ecx), "=&r" (bkup_ss), "=&r" (bkup_esp)
+ : "i" (EBDA_OFFSET_TOP_STACK), "r" (ebda_seg), "m" (*(u8*)func)
+ : "cc", "memory");
+ return eax;
+}
// Sum the bytes in the specified area.
u8
-checksum(u8 *far_data, u32 len)
+checksum_far(u16 buf_seg, void *buf_far, u32 len)
{
+ SET_SEG(ES, buf_seg);
u32 i;
u8 sum = 0;
for (i=0; i<len; i++)
- sum += GET_FARPTR(far_data[i]);
+ sum += GET_VAR(ES, ((u8*)buf_far)[i]);
return sum;
}
-// Sleep for n microseconds. currently using the
-// refresh request port 0x61 bit4, toggling every 15usec
-void
-usleep(u32 count)
+u8
+checksum(void *buf, u32 len)
{
- count = count / 15;
- u8 kbd = inb(PORT_PS2_CTRLB);
- while (count)
- if ((inb(PORT_PS2_CTRLB) ^ kbd) & KBD_REFRESH)
- count--;
+ return checksum_far(GET_SEG(SS), buf, len);
+}
+
+size_t
+strlen(const char *s)
+{
+ if (__builtin_constant_p(s))
+ return __builtin_strlen(s);
+ const char *p = s;
+ while (*p)
+ p++;
+ return p-s;
+}
+
+// Compare two areas of memory.
+int
+memcmp(const void *s1, const void *s2, size_t n)
+{
+ while (n) {
+ if (*(u8*)s1 != *(u8*)s2)
+ return *(u8*)s1 < *(u8*)s2 ? -1 : 1;
+ s1++;
+ s2++;
+ n--;
+ }
+ return 0;
+}
+
+// Compare two strings.
+int
+strcmp(const char *s1, const char *s2)
+{
+ for (;;) {
+ if (*s1 != *s2)
+ return *s1 < *s2 ? -1 : 1;
+ if (! *s1)
+ return 0;
+ s1++;
+ s2++;
+ }
+}
+
+inline void
+memset_far(u16 d_seg, void *d_far, u8 c, size_t len)
+{
+ SET_SEG(ES, d_seg);
+ asm volatile(
+ "rep stosb %%es:(%%di)"
+ : "+c"(len), "+D"(d_far)
+ : "a"(c)
+ : "cc", "memory");
+}
+
+inline void
+memset16_far(u16 d_seg, void *d_far, u16 c, size_t len)
+{
+ len /= 2;
+ SET_SEG(ES, d_seg);
+ asm volatile(
+ "rep stosw %%es:(%%di)"
+ : "+c"(len), "+D"(d_far)
+ : "a"(c)
+ : "cc", "memory");
}
void *
return s;
}
+inline void
+memcpy_far(u16 d_seg, void *d_far, u16 s_seg, const void *s_far, size_t len)
+{
+ SET_SEG(ES, d_seg);
+ u16 bkup_ds;
+ asm volatile(
+ "movw %%ds, %w0\n"
+ "movw %w4, %%ds\n"
+ "rep movsb (%%si),%%es:(%%di)\n"
+ "movw %w0, %%ds"
+ : "=&r"(bkup_ds), "+c"(len), "+S"(s_far), "+D"(d_far)
+ : "r"(s_seg)
+ : "cc", "memory");
+}
+
+void *
+#undef memcpy
+memcpy(void *d1, const void *s1, size_t len)
+#define memcpy __builtin_memcpy
+{
+ void *d = d1;
+ if (((u32)d1 | (u32)s1 | len) & 3) {
+ // non-aligned memcpy
+ asm volatile(
+ "rep movsb (%%esi),%%es:(%%edi)"
+ : "+c"(len), "+S"(s1), "+D"(d)
+ : : "cc", "memory");
+ return d1;
+ }
+ // Common case - use 4-byte copy
+ len /= 4;
+ asm volatile(
+ "rep movsl (%%esi),%%es:(%%edi)"
+ : "+c"(len), "+S"(s1), "+D"(d)
+ : : "cc", "memory");
+ return d1;
+}
+
void *
-memcpy(void *far_d1, const void *far_s1, size_t len)
+memmove(void *d, const void *s, size_t len)
{
- u8 *d = far_d1;
- u8 *s = (u8*)far_s1;
+ if (s >= d)
+ return memcpy(d, s, len);
+ d += len-1;
+ s += len-1;
while (len--) {
- SET_FARPTR(*d, GET_FARPTR(*s));
- d++;
- s++;
+ *(char*)d = *(char*)s;
+ d--;
+ s--;
}
- return far_d1;
+ return d;
}
-void
-__set_fail(const char *fname, struct bregs *regs)
+// Copy a string - truncating it if necessary.
+char *
+strtcpy(char *dest, const char *src, size_t len)
{
- __debug_fail(fname, regs);
- set_cf(regs, 1);
+ char *d = dest;
+ while (len-- && *src != '\0')
+ *d++ = *src++;
+ *d = '\0';
+ return dest;
}
+// Wait for 'usec' microseconds with irqs enabled.
void
-__set_code_fail(const char *fname, struct bregs *regs, u8 code)
+usleep(u32 usec)
{
- __set_fail(fname, regs);
- regs->ah = code;
+ struct bregs br;
+ memset(&br, 0, sizeof(br));
+ br.ah = 0x86;
+ br.cx = usec >> 16;
+ br.dx = usec;
+ call16_int(0x15, &br);
+}
+
+// See if a keystroke is pending in the keyboard buffer.
+static int
+check_for_keystroke()
+{
+ struct bregs br;
+ memset(&br, 0, sizeof(br));
+ br.ah = 1;
+ call16_int(0x16, &br);
+ return !(br.flags & F_ZF);
+}
+
+// Return a keystroke - waiting forever if necessary.
+static int
+get_raw_keystroke()
+{
+ struct bregs br;
+ memset(&br, 0, sizeof(br));
+ call16_int(0x16, &br);
+ return br.ah;
+}
+
+// Read a keystroke - waiting up to 'msec' milliseconds.
+int
+get_keystroke(int msec)
+{
+ for (;;) {
+ if (check_for_keystroke())
+ return get_raw_keystroke();
+ if (msec <= 0)
+ return -1;
+ usleep(50*1000);
+ msec -= 50;
+ }
}