diff options
Diffstat (limited to 'src/kernel/syscalls.c')
| -rw-r--r-- | src/kernel/syscalls.c | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c index 47f8b2b..7234e10 100644 --- a/src/kernel/syscalls.c +++ b/src/kernel/syscalls.c @@ -23,15 +23,27 @@ int _syscall_fork() { int _syscall_debuglog(const char *msg, size_t len) { struct pagedir *pages = process_current->pages; - void *phys = pagedir_virt2phys(pages, msg, true, false); + size_t remaining = len; - // page overrun check - if (((uintptr_t)msg & PAGE_MASK) + len > PAGE_SIZE) - len = PAGE_SIZE - ((uintptr_t)msg & PAGE_MASK); - if (((uintptr_t)msg & PAGE_MASK) + len > PAGE_SIZE) - panic(); // just in case I made an off by 1 error + while (remaining > 0) { + /* note: While i'm pretty sure that this should always work, this + * was only tested in cases where the pages were consecutive both in + * virtual and physical memory, which might not always be the case. + * TODO test this */ + + void *phys = pagedir_virt2phys(pages, msg, true, false); + size_t partial = remaining; + + // don't read past the page + if (((uintptr_t)msg & PAGE_MASK) + remaining > PAGE_SIZE) + partial = PAGE_SIZE - ((uintptr_t)msg & PAGE_MASK); + + tty_write(phys, partial); + + remaining -= partial; + msg += partial; + } - tty_write(phys, len); return len; } |