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| author | Phil Dennis-Jordan <phil@philjordan.eu> | 2017-04-07 18:25:57 +1200 |
|---|---|---|
| committer | Laszlo Ersek <lersek@redhat.com> | 2017-04-07 12:22:30 +0200 |
| commit | 05a5379458725234de8a05780fcb5da2c12680e4 (patch) | |
| tree | 1513828a075954852173baa3b3a0d2b8574c02d2 /OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf | |
| parent | 9bcca53fe466cdff397578328d9d87d257aba493 (diff) | |
| download | edk2-05a5379458725234de8a05780fcb5da2c12680e4.tar.gz edk2-05a5379458725234de8a05780fcb5da2c12680e4.tar.bz2 edk2-05a5379458725234de8a05780fcb5da2c12680e4.zip | |
OvmfPkg/QemuVideoDxe: Helper functions for unaligned port I/O.
The VMWare SVGA display device implemented by Qemu (-vga vmware) uses
an I/O-type BAR which is laid out such that some register offsets are
not aligned to the read/write width with which they are expected to be
accessed. (The register value port has an offset of 1 and requires
32 bit wide read/write access.)
The EFI_PCI_IO_PROTOCOL's Io.Read/Io.Write functions do not support
such unaligned I/O.
Before a driver for this device can be added to QemuVideoDxe, helper
functions for unaligned I/O are therefore required. This adds the
functions UnalignedIoWrite32 and UnalignedIoRead32, based on IoLib's
IoWrite32 and IoRead32, for the Ia32 and X64 architectures. Port I/O
requires inline assembly, so implementations are provided for the GCC,
ICC, and Microsoft compiler families. Such I/O is not possible on other
architectures, a dummy (ASSERT()ing) implementation is therefore
provided to satisfy the linker.
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Suggested-by: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Diffstat (limited to 'OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf')
| -rw-r--r-- | OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf b/OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf index affb6ffd88..346a5aed94 100644 --- a/OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf +++ b/OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf @@ -41,6 +41,12 @@ [Sources.Ia32, Sources.X64]
VbeShim.c
+ UnalignedIoGcc.c | GCC
+ UnalignedIoMsc.c | MSFT
+ UnalignedIoIcc.c | INTEL
+
+[Sources.IPF, Sources.EBC, Sources.ARM, Sources.AARCH64]
+ UnalignedIoUnsupported.c
[Packages]
MdePkg/MdePkg.dec
|