diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2022-04-06 02:29:24 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2022-04-07 08:27:52 -0700 |
| commit | eb4ea1ae8f45e3249e7586f30be8977478202a37 (patch) | |
| tree | 5ace75b43fad2217fc8eead995690b73776bba5d /arch/x86/realmode | |
| parent | 1e8f93e18379d05da9fd130eb7d50988a20f8b9a (diff) | |
| download | linux-eb4ea1ae8f45e3249e7586f30be8977478202a37.tar.bz2 | |
x86/boot: Port I/O: Allow to hook up alternative helpers
Port I/O instructions trigger #VE in the TDX environment. In response to
the exception, kernel emulates these instructions using hypercalls.
But during early boot, on the decompression stage, it is cumbersome to
deal with #VE. It is cleaner to go to hypercalls directly, bypassing #VE
handling.
Add a way to hook up alternative port I/O helpers in the boot stub with
a new pio_ops structure. For now, set the ops structure to just call
the normal I/O operation functions.
out*()/in*() macros redefined to use pio_ops callbacks. It eliminates
need in changing call sites. io_delay() changed to use port I/O helper
instead of inline assembly.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lkml.kernel.org/r/20220405232939.73860-16-kirill.shutemov@linux.intel.com
Diffstat (limited to 'arch/x86/realmode')
| -rw-r--r-- | arch/x86/realmode/rm/wakemain.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/realmode/rm/wakemain.c b/arch/x86/realmode/rm/wakemain.c index 1d6437e6d2ba..a6f4d8388ad8 100644 --- a/arch/x86/realmode/rm/wakemain.c +++ b/arch/x86/realmode/rm/wakemain.c @@ -62,8 +62,12 @@ static void send_morse(const char *pattern) } } +struct port_io_ops pio_ops; + void main(void) { + init_default_io_ops(); + /* Kill machine if structures are wrong */ if (wakeup_header.real_magic != 0x12345678) while (1) |