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Map APIs

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This commit is contained in:
Erin 2023-07-12 14:56:11 +02:00
parent 81cf5c4336
commit beb6e23d71
1 changed files with 30 additions and 11 deletions
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41
hbvm/src/vm/mem/mod.rs
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@ -64,6 +64,25 @@ impl Memory {
} }
} }
/// Maps host's memory into VM's memory
///
/// # Safety
/// Who knows.
pub unsafe fn map(
&mut self,
mut host: *mut u8,
target: usize,
pagesize: PageSize,
count: usize,
) {
todo!()
}
/// Unmaps pages from VM's memory
pub fn unmap(&mut self, addr: usize, count: usize) {
todo!()
}
/// Load value from an address /// Load value from an address
/// ///
/// # Safety /// # Safety
@ -215,11 +234,11 @@ impl Memory {
action: fn(*mut u8, *mut u8, usize), action: fn(*mut u8, *mut u8, usize),
traph: &mut impl HandlePageFault, traph: &mut impl HandlePageFault,
) -> Result<(), u64> { ) -> Result<(), u64> {
let mut pspl = AddrSplitter::new(src, len, self.root_pt); let mut pspl = AddrPageLookuper::new(src, len, self.root_pt);
loop { loop {
match pspl.next() { match pspl.next() {
// Page found // Page found
Some(Ok(AddrSplitOk { Some(Ok(AddrPageLookupOk {
vaddr, vaddr,
ptr, ptr,
size, size,
@ -233,7 +252,7 @@ impl Memory {
action(ptr, dst, size); action(ptr, dst, size);
dst = unsafe { dst.add(size) }; dst = unsafe { dst.add(size) };
} }
Some(Err(AddrSplitError { addr, size })) => { Some(Err(AddrPageLookupError { addr, size })) => {
// Execute page fault handler // Execute page fault handler
if traph.page_fault(reason, self, addr, size, dst) { if traph.page_fault(reason, self, addr, size, dst) {
// Shift the splitter address // Shift the splitter address
@ -252,7 +271,7 @@ impl Memory {
} }
/// Result from address split /// Result from address split
struct AddrSplitOk { struct AddrPageLookupOk {
/// Virtual address /// Virtual address
vaddr: u64, vaddr: u64,
@ -266,7 +285,7 @@ struct AddrSplitOk {
perm: Permission, perm: Permission,
} }
struct AddrSplitError { struct AddrPageLookupError {
/// Address of failure /// Address of failure
addr: u64, addr: u64,
@ -275,7 +294,7 @@ struct AddrSplitError {
} }
/// Address splitter into pages /// Address splitter into pages
struct AddrSplitter { struct AddrPageLookuper {
/// Current address /// Current address
addr: u64, addr: u64,
@ -286,7 +305,7 @@ struct AddrSplitter {
pagetable: *const PageTable, pagetable: *const PageTable,
} }
impl AddrSplitter { impl AddrPageLookuper {
/// Create a new page splitter /// Create a new page splitter
pub const fn new(addr: u64, size: usize, pagetable: *const PageTable) -> Self { pub const fn new(addr: u64, size: usize, pagetable: *const PageTable) -> Self {
Self { Self {
@ -303,8 +322,8 @@ impl AddrSplitter {
} }
} }
impl Iterator for AddrSplitter { impl Iterator for AddrPageLookuper {
type Item = Result<AddrSplitOk, AddrSplitError>; type Item = Result<AddrPageLookupOk, AddrPageLookupError>;
fn next(&mut self) -> Option<Self::Item> { fn next(&mut self) -> Option<Self::Item> {
// The end, everything is fine // The end, everything is fine
@ -328,7 +347,7 @@ impl Iterator for AddrSplitter {
match entry.permission() { match entry.permission() {
// No page → page fault // No page → page fault
Permission::Empty => { Permission::Empty => {
return Some(Err(AddrSplitError { return Some(Err(AddrPageLookupError {
addr: self.addr, addr: self.addr,
size: PageSize::from_lvl(lvl)?, size: PageSize::from_lvl(lvl)?,
})) }))
@ -358,7 +377,7 @@ impl Iterator for AddrSplitter {
let avail = (size as usize - offset).clamp(0, self.size); let avail = (size as usize - offset).clamp(0, self.size);
self.bump(size); self.bump(size);
Some(Ok(AddrSplitOk { Some(Ok(AddrPageLookupOk {
vaddr: self.addr, vaddr: self.addr,
ptr: unsafe { base.add(offset) }, // Return pointer to the start of region ptr: unsafe { base.add(offset) }, // Return pointer to the start of region
size: avail, size: avail,