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Kernel: Add an InterruptFlagSaver helper class.

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This is useful instead of InterruptDisabler in some cases.
This commit is contained in:
Andreas Kling 2019-02-05 11:13:34 +01:00
parent cd1bbdf052
commit b782055b96
5 changed files with 28 additions and 18 deletions
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11
Kernel/MemoryManager.cpp
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@ -304,12 +304,11 @@ bool MemoryManager::page_in_from_inode(Region& region, unsigned page_index_in_re
auto& vmo_page = vmo.physical_pages()[region.first_page_index() + page_index_in_region];
// FIXME: Maybe this should have a separate class like InterruptFlagSaver?
InterruptDisabler disabler;
InterruptFlagSaver saver;
disabler.temporarily_sti();
sti();
LOCKER(vmo.m_paging_lock);
disabler.temporarily_cli();
cli();
if (!vmo_page.is_null()) {
kprintf("MM: page_in_from_inode() but page already present. Fine with me!\n");
@ -320,7 +319,7 @@ bool MemoryManager::page_in_from_inode(Region& region, unsigned page_index_in_re
#ifdef MM_DEBUG
dbgprintf("MM: page_in_from_inode ready to read from inode\n");
#endif
disabler.temporarily_sti();
sti();
byte page_buffer[PAGE_SIZE];
auto& inode = *vmo.inode();
auto nread = inode.read_bytes(vmo.inode_offset() + ((region.first_page_index() + page_index_in_region) * PAGE_SIZE), PAGE_SIZE, page_buffer, nullptr);
@ -332,7 +331,7 @@ bool MemoryManager::page_in_from_inode(Region& region, unsigned page_index_in_re
// If we read less than a page, zero out the rest to avoid leaking uninitialized data.
memset(page_buffer + nread, 0, PAGE_SIZE - nread);
}
disabler.temporarily_cli();
cli();
vmo_page = allocate_physical_page(ShouldZeroFill::No);
if (vmo_page.is_null()) {
kprintf("MM: page_in_from_inode was unable to allocate a physical page\n");