bios_wini driver

kernel/system/Makefile

@@ -29,6 +29,7 @@ OBJECTS	= \
 	$(SYSTEM)(do_irqctl.o) \
 	$(SYSTEM)(do_devio.o) \
 	$(SYSTEM)(do_vdevio.o) \
+	$(SYSTEM)(do_int86.o) \
 	$(SYSTEM)(do_sdevio.o) \
 	$(SYSTEM)(do_copy.o) \
 	$(SYSTEM)(do_vcopy.o) \
@@ -96,6 +97,9 @@ $(SYSTEM)(do_sdevio.o):	do_sdevio.c
 $(SYSTEM)(do_vdevio.o):	do_vdevio.c
 	$(CC) do_vdevio.c
 
+$(SYSTEM)(do_int86.o):	do_int86.c
+	$(CC) do_int86.c
+
 $(SYSTEM)(do_copy.o):	do_copy.c
 	$(CC) do_copy.c
 
@@ -134,4 +138,3 @@ $(SYSTEM)(do_privctl.o):	do_privctl.c
 
 $(SYSTEM)(do_segctl.o):	do_segctl.c
 	$(CC) do_segctl.c
-

kernel/system/do_bios.c

@@ -0,0 +1 @@
+

kernel/system/do_getinfo.c

@@ -15,6 +15,9 @@
 
 #include "../system.h"
 
+static unsigned long bios_buf[1024];	/* 4K, what about alignment */
+static vir_bytes bios_buf_vir, bios_buf_len;
+
 #if USE_GETINFO
 
 /*===========================================================================*
@@ -113,6 +116,22 @@ register message *m_ptr;	/* pointer to request message */
     break;
     }
 #endif
+    case GET_BIOSBUFFER:
+    	bios_buf_vir = (vir_bytes)bios_buf;
+    	bios_buf_len = sizeof(bios_buf);
+
+    	length = sizeof(bios_buf_len);
+    	src_phys = vir2phys(&bios_buf_len);
+	if (length != m_ptr->I_VAL_LEN2) return (EINVAL);
+	proc_nr = m_ptr->m_source;	/* only caller can request copy */
+	dst_phys = numap_local(proc_nr, (vir_bytes) m_ptr->I_VAL_PTR2, length); 
+	if (src_phys == 0 || dst_phys == 0) return(EFAULT);
+	phys_copy(src_phys, dst_phys, length);
+
+    	length = sizeof(bios_buf_vir);
+    	src_phys = vir2phys(&bios_buf_vir);
+    	break;
+
     default:
         return(EINVAL);
   }

kernel/system/do_int86.c

@@ -0,0 +1,46 @@
+/* The system call implemented in this file:
+ *   m_type:	SYS_INT86
+ *
+ * The parameters for this system call are:
+ *    m1_p1:	INT86_REG86     
+ */
+
+#include "../system.h"
+#include <minix/type.h>
+#include <ibm/int86.h>
+
+struct reg86u reg86;
+
+/*===========================================================================*
+ *				do_int86					     *
+ *===========================================================================*/
+PUBLIC int do_int86(m_ptr)
+register message *m_ptr;	/* pointer to request message */
+{
+  int caller;
+  vir_bytes caller_vir;
+  phys_bytes caller_phys, kernel_phys;
+
+  caller = (int) m_ptr->m_source; 
+  caller_vir = (vir_bytes) m_ptr->INT86_REG86;
+  caller_phys = umap_local(proc_addr(caller), D, caller_vir, sizeof(reg86));
+  if (0 == caller_phys) return(EFAULT);
+  kernel_phys = vir2phys(&reg86);
+  phys_copy(caller_phys, kernel_phys, (phys_bytes) sizeof(reg86));
+
+  level0(int86);
+
+  /* Copy results back to the caller */
+  phys_copy(kernel_phys, caller_phys, (phys_bytes) sizeof(reg86));
+
+  /* The BIOS call eats interrupts. Call get_randomness to generate some
+   * entropy. Normally, get_randomness is called from an interrupt handler.
+   * Figuring out the exact source is too complicated. CLOCK_IRQ is normally
+   * not very random.
+   */
+  lock(0, "do_int86");
+  get_randomness(CLOCK_IRQ);
+  unlock(0);
+
+  return(OK);
+}