Since both the stage2 bootloader and the SVSM kernel dump the CPUID
page, there needs to be a page present at the respective GPA on TDP
platforms. Insert a normal zero page at the CPUID page location so that
dump_cpuid_table() can work as expected.

Signed-off-by: Peter Fang <[email protected]>

Since the SVSM kernel touches the secrets page in svsm_start(), there
needs to be a page present at the respective GPA on TDP platforms.
Insert a normal zero page at the secrets page location so that the SVSM
kernel can touch it without issues.

Signed-off-by: Peter Fang <[email protected]>

Clean up formatting and crate ordering.

Signed-off-by: Peter Fang <[email protected]>

Add the tdx-tdcall crate in preparation for the upcoming TDX enabling
changes.

Signed-off-by: Peter Fang <[email protected]>

Stage2LaunchInfo has been increased to 48 bytes. Make the according
changes in stage1 trampoline.

Signed-off-by: Peter Fang <[email protected]>

Setting the initial location counter has no effect since all of the
addresses before edata are derived based on the subsequent locations.

Signed-off-by: Peter Fang <[email protected]>

Add GHCI-based PIO driver to TdpPlatform. This implementation translates
all of the in/out operations to TDVMCALL operations as required by the
GHCI spec.

Additionally, move console initialization to env_setup() to enable it as
early as possible.

Signed-off-by: Peter Fang <[email protected]>

Make stage2 a tad more verbose by signaling when it's about ready to
jump into the SVSM kernel.

Signed-off-by: Peter Fang <[email protected]>

phys_addr_sizes should be the entirety of CPUID leaf 0x80000008.EAX, not
just the Physical Address Bits field.

Signed-off-by: Peter Fang <[email protected]>

This is in preparation for the upcoming changes to
PageTable::virt_to_phys(). Since 1G huge pages are architecturally
permissible when translating a virtual address, PAGE_SIZE_1G is now a
valid page size even though it's currently not actively used anywhere.

Signed-off-by: Peter Fang <[email protected]>

PageFrame is an enum describing not only a physical address, but also
the page frame to which it belongs.

- PageFrame::address(): return its internal PhysAddr
- PageFrame::start(): return the beginning of the page frame
- PageFrame::end(): return the end of the page frame

Signed-off-by: Peter Fang <[email protected]>

virt_to_frame() not only returns the translated physical address, but
also returns the size of the underlying page through PageFrame.

Signed-off-by: Peter Fang <[email protected]>

On TDP platforms, page validation means page acceptance. Implement
validate_{physical, virtual}_page_range() using the tdx-tdcall crate for
this TDCALL operation. Page invalidation simply means zeroing out the
page on TDP platforms.

Signed-off-by: Peter Fang <[email protected]>