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Restrict superpage allocation on Darwin to AMD64 and 2MiB

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There's a possibility that Darwin does not support anything else, in
terms of size or architecture.
This commit is contained in:
Feoramund
2025-01-28 14:13:04 -05:00
parent 1e62f2c8c4
commit 4c59019a57
1 changed files with 8 additions and 4 deletions
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12
base/runtime/virtual_memory_darwin.odin
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@@ -52,10 +52,14 @@ _allocate_virtual_memory :: proc "contextless" (size: int) -> rawptr {
_allocate_virtual_memory_superpage :: proc "contextless" () -> rawptr {
address: u64
flags: i32 = VM_FLAGS_ANYWHERE
when SUPERPAGE_SIZE == 2 * Megabyte {
flags |= VM_FLAGS_SUPERPAGE_SIZE_2MB
} else {
flags |= VM_FLAGS_SUPERPAGE_SIZE_ANY
when ODIN_ARCH == .amd64 {
// NOTE(Feoramund): As far as we are aware, Darwin only supports
// explicit superpage allocation on AMD64 with a 2MiB parameter.
when SUPERPAGE_SIZE == 2 * Megabyte {
flags |= VM_FLAGS_SUPERPAGE_SIZE_2MB
} else {
#panic("An unsupported superpage size has been configured for AMD64 Darwin; only 2MB is supported.")
}
}
alignment_mask: u64 = SUPERPAGE_SIZE - 1 // Assumes a power of two size, ensured by an assertion in `virtual_memory.odin`.
result := mach_vm_map(mach_task_self(), &address, SUPERPAGE_SIZE, alignment_mask, flags, MEMORY_OBJECT_NULL, 0, false, VM_PROT_READ|VM_PROT_WRITE, VM_PROT_READ|VM_PROT_WRITE, VM_INHERIT_SHARE)