[M] Change in coreboot[main]: cpu/x86/64bit: Install extended page tables in BSS

[Paul Menzel (Code Review)]

Attention is currently required from: Christian Walter, Intel coreboot Reviewers, Johnny Lin, Jonathan Zhang, Jérémy Compostella, Patrick Rudolph, Shuo Liu, Tim Chu.

Paul Menzel has posted comments on this change by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/85806?usp=email )

Change subject: cpu/x86/64bit: Install extended page tables in BSS
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Patch Set 6:

(4 comments)

File src/cpu/x86/64bit/mmu.c:

https://review.coreboot.org/c/coreboot/+/85806/comment/88a901cc_771e434e?usp... :
PS6, Line 45: PT),
fits on the line above.

https://review.coreboot.org/c/coreboot/+/85806/comment/91053c69_a4702e7c?usp... :
PS6, Line 132: 	uint64_t *limit = (uint64_t *)gp;
Add a blank line above?

https://review.coreboot.org/c/coreboot/+/85806/comment/5f506ca1_3e8a99e9?usp... :
PS6, Line 160: if (cpu_supports_1gb_hugepage())
             : 		return BITS_PER_VA_LVL4;
             : 	return 40;
```suggestion
    return cpu_supports_1gb_hugepage() ? BITS_PER_VA_LVL4 : 40;
```

https://review.coreboot.org/c/coreboot/+/85806/comment/26e6b0dc_1f5f0edf?usp... :
PS6, Line 178: printk(BIOS_DEBUG, "MMU: Upper MEM limit is 0x%llx\n", limit);
             : 	printk(BIOS_DEBUG, "MMU: New page tables are%s required\n",
             : 	       (limit > mmu_default_map_size()) ? "" : "n't");
Also log mmu_default_map_size()?
> MMU: New page tables are%s required (limit = x, default map size = y)