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#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;
}
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