Import code for article1, 2, 3, 4

1 files changed, 119 insertions, 0 deletions

diff --git a/sos-code-article4/drivers/bochs.c b/sos-code-article4/drivers/bochs.c
new file mode 100644
index 0000000..db18599
--- /dev/null
+++ b/sos-code-article4/drivers/bochs.c
@@ -0,0 +1,119 @@
+/* Copyright (C) 2004  David Decotigny
+   Copyright (C) 1999  Free Software Foundation, Inc.
+
+   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; either version 2
+   of the License, or (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA. 
+*/
+#include <hwcore/ioports.h>
+#include <sos/klibc.h>
+
+#include "bochs.h"
+
+/* This is a special hack that is only useful when running the
+   operating system under the Bochs emulator.  */
+#define SOS_BOCHS_IOPORT 0xe9
+
+sos_ret_t sos_bochs_setup(void)
+{
+  return SOS_OK;
+}
+
+
+#define sos_bochs_putchar(chr) \
+    outb((chr), SOS_BOCHS_IOPORT)
+
+sos_ret_t sos_bochs_putstring(const char* str)
+{
+  for ( ; str && (*str != '\0') ; str++)
+    sos_bochs_putchar(*str);
+
+  return SOS_OK;
+}
+
+
+sos_ret_t sos_bochs_puthex(unsigned val, int nbytes)
+{
+  unsigned c;
+
+#define BOCHS_PRTHEX(q) \
+  ({ unsigned char r; if ((q) >= 10) r='a'+(q)-10; \
+     else r='0'+(q); sos_bochs_putchar(r); })
+
+  switch (nbytes)
+    {
+    case 4:
+      c = (val >> 24) & 0xff;
+      BOCHS_PRTHEX((c >> 4)&0xf);
+      BOCHS_PRTHEX(c&0xf);
+    case 3:
+      c = (val >> 16) & 0xff;
+      BOCHS_PRTHEX((c >> 4)&0xf);
+      BOCHS_PRTHEX(c&0xf);
+    case 2:
+      c = (val >> 8) & 0xff;
+      BOCHS_PRTHEX((c >> 4)&0xf);
+      BOCHS_PRTHEX(c&0xf);
+    case 1:
+      c = val & 0xff;
+      BOCHS_PRTHEX((c >> 4)&0xf);
+      BOCHS_PRTHEX(c&0xf);
+    }
+
+  return SOS_OK;
+}
+
+
+sos_ret_t sos_bochs_hexdump(const void* addr, int nbytes)
+{
+  int offs;
+  for (offs = 0 ; offs < nbytes ; offs++)
+    {
+      const unsigned char *c;
+      
+      if ((offs % 16) == 0)
+	{
+	  sos_bochs_putstring("0x");
+	  sos_bochs_puthex(offs, 4);
+	}
+      
+      if ((offs % 8) == 0)
+	sos_bochs_putstring("   ");
+
+      c = (const unsigned char*)(addr + offs);
+      sos_bochs_puthex(*c, 1);
+      sos_bochs_putstring(" ");
+      
+      if (((offs + 1) % 16) == 0)
+        sos_bochs_putstring("\n");
+    }
+
+  if (offs % 16)
+    sos_bochs_putstring("\n");
+
+  return SOS_OK;
+}
+
+
+sos_ret_t sos_bochs_printf(const char *format, /* args */...)
+{
+  char buff[256];
+  va_list ap;
+  
+  va_start(ap, format);
+  vsnprintf(buff, sizeof(buff), format, ap);
+  va_end(ap);
+  
+  return sos_bochs_putstring(buff);
+}