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Set up initial task switching (ring0 only)

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This commit is contained in:
Justin C. Miller
2018-05-18 23:55:15 -07:00
parent 0ddcf668cb
commit bfaab294e6
12 changed files with 239 additions and 45 deletions
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32
src/kernel/apic.cpp
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@@ -52,28 +52,38 @@ lapic::lapic(uint32_t *base, isr spurious) :
void
lapic::enable_timer(isr vector, uint8_t divisor, uint32_t count, bool repeat)
{
uint32_t divbits = 0;
switch (divisor) {
case 1: divisor = 11; break;
case 2: divisor = 0; break;
case 4: divisor = 1; break;
case 8: divisor = 2; break;
case 16: divisor = 3; break;
case 32: divisor = 8; break;
case 64: divisor = 9; break;
case 128: divisor = 10; break;
case 1: divbits = 0xb; break;
case 2: divbits = 0x0; break;
case 4: divbits = 0x1; break;
case 8: divbits = 0x2; break;
case 16: divbits = 0x3; break;
case 32: divbits = 0x8; break;
case 64: divbits = 0x9; break;
case 128: divbits = 0xa; break;
default:
kassert(0, "Invalid divisor passed to lapic::enable_timer");
}
apic_write(m_base, 0x3e0, divisor);
apic_write(m_base, 0x380, count);
uint32_t lvte = static_cast<uint8_t>(vector);
if (repeat)
lvte |= 0x20000;
log::debug(logs::apic, "Enabling APIC timer with isr %d.", vector);
apic_write(m_base, 0x320, lvte);
apic_write(m_base, 0x3e0, divbits);
reset_timer(count);
}
uint32_t
lapic::reset_timer(uint32_t count)
{
uint32_t remaining = apic_read(m_base, 0x380);
apic_write(m_base, 0x380, count);
return remaining;
}
void