d1ca8cc638
Linux has two bugs in its handling of the x86 MP table: 1. It assumes that there is always 640 kB of base memory, and looks for the MP table in the top kB of this even if the memory map indicates that memory location does not exist. 2. It ignores that entry_count field and instead iterates through the MP table by scanning until it runs out of bytes in the table. The Firecracker VM (and probably other related VMs) relies on both of these bugs. With the MPTABLE_LINUX_BUG_COMPAT option, we search for the MP table at address 639k even if that isn't in the memory map; and replace a zeroed entry_count with a value computed from scanning the table until we run out of table bytes. Reviewed by: imp Sponsored by: https://www.patreon.com/cperciva Differential Revision: https://reviews.freebsd.org/D35799
113 lines
2.5 KiB
Plaintext
113 lines
2.5 KiB
Plaintext
# $FreeBSD$
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# Options specific to the i386 platform kernels
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AUTO_EOI_1 opt_auto_eoi.h
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AUTO_EOI_2 opt_auto_eoi.h
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BROKEN_KEYBOARD_RESET opt_reset.h
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COUNT_XINVLTLB_HITS opt_smp.h
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COUNT_IPIS opt_smp.h
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DISABLE_PG_G opt_pmap.h
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DISABLE_PSE opt_pmap.h
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MAXMEM
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MPTABLE_FORCE_HTT
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NKPT opt_pmap.h
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PERFMON
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PMAP_SHPGPERPROC opt_pmap.h
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POWERFAIL_NMI opt_trap.h
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PV_STATS opt_pmap.h
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# Options for emulators. These should only be used at config time, so
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# they are handled like options for static filesystems
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# (see src/sys/conf/options), except for broken debugging options.
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COMPAT_AOUT opt_dontuse.h
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COMPAT_LINUX opt_dontuse.h
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LINPROCFS opt_dontuse.h
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LINSYSFS opt_dontuse.h
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# Change KVM size. Changes things all over the kernel.
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KVA_PAGES opt_global.h
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# Physical address extensions and support for >4G ram. As above.
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PAE opt_global.h
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TIMER_FREQ opt_clock.h
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CPU_ATHLON_SSE_HACK opt_cpu.h
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CPU_BLUELIGHTNING_3X opt_cpu.h
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CPU_BLUELIGHTNING_FPU_OP_CACHE opt_cpu.h
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CPU_BTB_EN opt_cpu.h
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CPU_CYRIX_NO_LOCK opt_cpu.h
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CPU_DIRECT_MAPPED_CACHE opt_cpu.h
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CPU_DISABLE_5X86_LSSER opt_cpu.h
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CPU_ELAN opt_cpu.h
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CPU_ELAN_PPS opt_cpu.h
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CPU_ELAN_XTAL opt_cpu.h
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CPU_ENABLE_LONGRUN opt_cpu.h
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CPU_FASTER_5X86_FPU opt_cpu.h
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CPU_GEODE opt_cpu.h
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CPU_I486_ON_386 opt_cpu.h
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CPU_IORT opt_cpu.h
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CPU_L2_LATENCY opt_cpu.h
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CPU_LOOP_EN opt_cpu.h
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CPU_PPRO2CELERON opt_cpu.h
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CPU_RSTK_EN opt_cpu.h
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CPU_SOEKRIS opt_cpu.h
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CPU_SUSP_HLT opt_cpu.h
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CPU_UPGRADE_HW_CACHE opt_cpu.h
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CPU_WT_ALLOC opt_cpu.h
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CYRIX_CACHE_REALLY_WORKS opt_cpu.h
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CYRIX_CACHE_WORKS opt_cpu.h
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NO_F00F_HACK opt_cpu.h
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NO_MEMORY_HOLE opt_cpu.h
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# The CPU type affects the endian conversion functions all over the kernel.
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I486_CPU opt_global.h
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I586_CPU opt_global.h
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I686_CPU opt_global.h
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VGA_ALT_SEQACCESS opt_vga.h
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VGA_DEBUG opt_vga.h
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VGA_NO_FONT_LOADING opt_vga.h
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VGA_NO_MODE_CHANGE opt_vga.h
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VGA_SLOW_IOACCESS opt_vga.h
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VGA_WIDTH90 opt_vga.h
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VESA
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VESA_DEBUG opt_vesa.h
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# AGP debugging support
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AGP_DEBUG opt_agp.h
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PSM_DEBUG opt_psm.h
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PSM_HOOKRESUME opt_psm.h
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PSM_RESETAFTERSUSPEND opt_psm.h
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ATKBD_DFLT_KEYMAP opt_atkbd.h
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# Video spigot
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SPIGOT_UNSECURE opt_spigot.h
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# Device options
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DEV_APIC opt_apic.h
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DEV_ATPIC opt_atpic.h
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# Debugging
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NPX_DEBUG opt_npx.h
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# BPF just-in-time compiler
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BPF_JITTER opt_bpf.h
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# Hyper-V support
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HYPERV opt_hyperv.h
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XENHVM opt_global.h
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# options for the Intel C600 SAS driver (isci)
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ISCI_LOGGING opt_isci.h
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# Don't create a "legacy" PCI bridge if none is found.
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NO_LEGACY_PCIB opt_cpu.h
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# Compatibility with Linux MP table bugs.
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MPTABLE_LINUX_BUG_COMPAT
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