diff options
Diffstat (limited to 'src/defs.rs')
| -rw-r--r-- | src/defs.rs | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/src/defs.rs b/src/defs.rs index af05da5..d9a15b5 100644 --- a/src/defs.rs +++ b/src/defs.rs @@ -1,5 +1,3 @@ -// exported symbols from asm/linker. -// They are always unsafe. extern "C" { fn ___KERNEL_PM_START__(); fn ___KERNEL_PM_END__(); @@ -7,25 +5,29 @@ extern "C" { fn ___BSS_END__(); } +// ANY ADDRESS FROM PHYSICAL MAPPING IS UNSAFE BECAUSE THE LOW MEMORY MAPPING +// WILL BE DROPPED FOR USERSPACE +// TODO: create VMAs in the MM struct #[inline] -pub fn pmap_kernel_start() -> u64 { +pub unsafe fn pmap_kernel_start() -> u64 { ___KERNEL_PM_START__ as u64 } #[inline] -pub fn pmap_kernel_end() -> u64 { +pub unsafe fn pmap_kernel_end() -> u64 { ___KERNEL_PM_END__ as u64 } #[inline] -pub fn vmap_kernel_start() -> u64 { +pub unsafe fn vmap_kernel_start() -> u64 { pmap_kernel_start() + Mem::KERNEL_OFFSET } #[inline] -pub fn vmap_kernel_end() -> u64 { +pub unsafe fn vmap_kernel_end() -> u64 { pmap_kernel_end() + Mem::KERNEL_OFFSET } +// ABOVE ONLY VALID BEFORE DROPPING LOWER MEMORY MAPPING -----// #[inline] pub fn bss_start() -> u64 { @@ -53,8 +55,6 @@ impl Mem { pub const K: u64 = 1024; pub const M: u64 = 1024 * Mem::K; pub const G: u64 = 1024 * Mem::M; - // physical memory layout: qemu defaults to 128 MiB phy Memory - pub const PHY_TOP: u64 = 128 * Mem::M; // 4 lv 4K paging pub const PAGE_SIZE: u64 = 0x1000; pub const PAGE_SHIFT: u64 = 12; @@ -67,16 +67,21 @@ impl Mem { pub const L2_MASK: u64 = 0x1ff << Mem::L2_SHIFT; pub const L3_SHIFT: u8 = 12; pub const L3_MASK: u64 = 0x1ff << Mem::L3_SHIFT; - pub const PHY_PAGES: u64 = Mem::PHY_TOP >> Mem::PAGE_SHIFT; + // 64 GiB available memory + pub const MAX_PHY_MEM: u64 = 0x1000000000; + // we should have at least 64 MiB free physical memory (excluding the kernel it self) + pub const MIN_PHY_MEM: u64 = 64 * Self::M; // size of frame allocator bitmap: number of physical frames / 8 for 128M // memory (37268) 4k pages, 37268 bits are needed, hence // 4096 bytes, exactly one page! - pub const PHY_BM_SIZE: u64 = Mem::PHY_PAGES >> 3; pub const ID_MAP_START: u64 = 0xffff_8000_0000_0000; pub const ID_MAP_END: u64 = 0xffff_8010_0000_0000; + // kernel image:0xffff_8020_0000_0000 ~ 0xffff_802f_0000_0000; pub const KERNEL_OFFSET: u64 = 0xffff_8020_0000_0000; - // 64 GiB available memory - pub const MAX_PHY_MEM: u64 = 0x1000000000; + // kernel heap: 0xffff_8030_0000_0000 ~ 0xffff_803f_0000_0000; + // (64 GiB) + pub const KERNEL_HEAP_START: u64 = 0xffff_8030_0000_0000; + pub const KERNEL_HEAP_END: u64 = 0xffff_8040_0000_0000; } // convert VA <-> PA wrt. the kernel id mapping |