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