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[librm] Transition to protected mode within init_librm()

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Long-mode operation will require page tables, which are too large to
sensibly fit in our .data16 segment in base memory.

Add a portion of init_librm() running in 32-bit protected mode to
provide access to high memory.  Use this portion of init_librm() to
initialise the .textdata variables "virt_offset", "text16", and
"data16", eliminating the redundant (re)initialisation currently
performed on every mode transition as part of real_to_prot().

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2016-02-19 00:56:20 +00:00
parent 31b5c2e753
commit 6eb1c927a3
2 changed files with 127 additions and 107 deletions
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5
src/arch/x86/include/librm.h
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@@ -14,10 +14,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define PHYSICAL_DS 0x20
#define REAL_CS 0x28
#define REAL_DS 0x30
#if 0
#define LONG_CS 0x38
#define LONG_DS 0x40
#endif
#define P2R_DS 0x38
#ifdef ASSEMBLY