1 files changed, 58 insertions, 0 deletions
diff --git a/src/pmbr.c b/src/pmbr.c
new file mode 100644
index 0000000..0ba1752
--- /dev/null
+++ b/src/pmbr.c
@@ -0,0 +1,58 @@
+#include "project.h"
+
+
+void mbr_entry_show(MBR_entry *e)
+{
+printf("      flags  %02x start chs %5d/%3d/%2d start sector %10d\n",
+	e->bootable,
+	MBR_CYLINDER(e->chs_start.cs),
+	e->chs_start.head,
+	MBR_SECTOR(e->chs_start.cs),
+	e->start);
+
+printf("      system %02x end   chs %5d/%3d/%2d end   sector %10d\n",
+	e->system,
+	MBR_CYLINDER(e->chs_end.cs),
+	e->chs_end.head,
+	MBR_SECTOR(e->chs_end.cs),
+	e->size+e->start);
+}
+void mbr_show(MBR *m)
+{
+int i;
+
+printf("  PMBR:\n");
+
+for (i=0;i<4;++i) {
+if (m->entry[i].system) {
+printf("    Entry %d:\n",i);
+mbr_entry_show(&m->entry[i]);
+}
+}
+if (memcmp(m->signature,MBR_SIGNATURE,sizeof(m->signature))) {
+printf("    Signature INVALID\n");
+} else {
+printf("    Signature valid\n");
+}
+}
+
+MBR mbr_new(uint64_t lbas)
+{
+uint64_t cyls=lbas;
+MBR ret={0};
+
+cyls=cyls/(63*255);
+if (cyls>1023) cyls=1023;
+
+ret.entry[0].bootable=0;
+ret.entry[0].chs_start.cs=MBR_CS(0,1);
+ret.entry[0].system=MBR_PARTITION_TYPE_EFI;
+ret.entry[0].chs_end.head=254;
+ret.entry[0].chs_end.cs=MBR_CS(cyls,63);
+ret.entry[0].start=1;
+ret.entry[0].size=lbas-1;
+
+memcpy(ret.signature,MBR_SIGNATURE,sizeof(ret.signature));
+
+return ret;
+}