diff options
| -rw-r--r-- | README.md | 13 | ||||
| -rw-r--r-- | src/kernel/dev/v86.c | 15 |
2 files changed, 6 insertions, 22 deletions
@@ -116,18 +116,6 @@ running the tests): ### Things to design -* Cache architecture : - - A RAM file is basically a bunch of pages that contain the data (rather than a segment of - malloc()'ed memory) - - A framebuffer device is basically a bunch of pages at a fixed hardware location, that cannot - grow - - In the two previous cases, the pages are never freed : they are not a cache, they are the - data itself. - - In the case of an on-disk file, the pages are a copy of the file's data that is originally - on-disk, and we might want to free these pages even while a process is using them, because - we can always reload them from the disk. - - An on-disk file with a page cache must be aware of all the places where the page is mapped, - so that it can unmap it when reclaiming pages. * Reclaiming physical memory : - Freeing some cached stuff, ie swapping pages from mmap regions - Swapping pages from processes non-mmap regions (ie real data regions) @@ -142,6 +130,7 @@ running the tests): ### Things not sure * VFS thread safety : is the design correct ? (probably) +* Cache architecture (called *pager*, after 4.4BSD terminology) * Not enough tests! ### Plans for the later future diff --git a/src/kernel/dev/v86.c b/src/kernel/dev/v86.c index 68bc375..183b791 100644 --- a/src/kernel/dev/v86.c +++ b/src/kernel/dev/v86.c @@ -207,17 +207,12 @@ void v86_ex_handler(registers_t *regs) { } void v86_pf_handler(void* zero, registers_t *regs, void* addr) { - if (addr < (void*)V86_STACK_TOP) { - pd_map_page(addr, (uint32_t)addr / PAGE_SIZE, true); - } else { - dbg_printf("Unexpected V86 PF at 0x%p\n", addr); + dbg_printf("Unexpected V86 PF at 0x%p\n", addr); - if (current_thread->user_ex_handler == v86_ex_handler) { - // we are in V86 thread - v86_exit_thread(false); - } else { - PANIC("V86 memory access exception."); - } + if (current_thread == v86_thread) { + v86_exit_thread(false); + } else { + PANIC("V86 memory access exception."); } } |