ref: 5f1b70f437ed4f598f9439e201f1f7644f5ce7b5
parent: 8debb0736ea5578a195ab663bf9565d6e52ad83b
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Sat Apr 4 12:48:37 EDT 2020
pc, pc64: new memory map code This replaces the memory map code for both pc and pc64 kernels with a unified implementation using the new portable memory map code. The main motivation is to be robust against broken e820 memory maps by the bios and delay the Conf.mem[] allocation after archinit(), so mp and acpi tables can be reserved and excluded from user memory. There are a few changes: new memreserve() function has been added for archinit() to reserve bios and acpi tables. upareserve() has been replaced by upaalloc(), which now has an address argument. umbrwmalloc() and umbmalloc() have been replaced by umballoc(). both upaalloc() and umballoc() return physical addresses or -1 on error. the physical address -1 is now used as a sentinel value instead of 0 when dealing with physical addresses. archmp and archacpi now always use vmap() to access the bios tables and reserve the ranges. more overflow checks have been added. ramscan() has been rewritten using vmap(). to handle the population of kernel memory, pc and pc64 now have pmap() and punmap() functions to do permanent mappings.