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Spawn Processes using memory primitives rather than and elf loader.

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This allows us to remove the temporary syscall for that style of process
spawn.
This commit is contained in:
Drew Galbraith 2023-06-07 00:04:53 -07:00
parent b06c76e477
commit 23895b5c6c
26 changed files with 403 additions and 94 deletions
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10
zion/common/gdt.cpp
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@ -34,7 +34,7 @@ struct GdtPointer {
uint64_t base;
} __attribute__((packed));
static uint64_t gGdtSegments[7];
static uint64_t gGdtSegments[8];
static TaskStateSegment gTaskStateSegment;
// Defined in load_gdt.s
@ -70,13 +70,15 @@ void InitGdt() {
// User CS
gGdtSegments[3] =
CreateSegment(default_bits | GDT_RING3 | GDT_EXECUTABLE, GDT_FLAGS);
// Copy for the sysret function.
gGdtSegments[5] = gGdtSegments[3];
// User DS
gGdtSegments[4] = CreateSegment(default_bits | GDT_RING3, GDT_FLAGS);
gTaskStateSegment.iomap_base = sizeof(TaskStateSegment);
gGdtSegments[5] = CreateTssSegment(&gTaskStateSegment);
gGdtSegments[6] = reinterpret_cast<uint64_t>(&gTaskStateSegment) >> 32;
gGdtSegments[6] = CreateTssSegment(&gTaskStateSegment);
gGdtSegments[7] = reinterpret_cast<uint64_t>(&gTaskStateSegment) >> 32;
GdtPointer gdtp{
.size = sizeof(gGdtSegments) - 1,
@ -86,7 +88,7 @@ void InitGdt() {
asm volatile("lgdt %0" ::"m"(gdtp));
ReloadSegments();
asm volatile(
"mov $0x28, %%ax;"
"mov $0x30, %%ax;"
"ltr %%ax;" ::
: "rax");
}