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_mmu_gate.nx

buildroot/runtime/_hdl_build/_mmu_gate.nx

6289 B119 linesdepth 2pulls 2 transitivereach 0 importersview sourcekind gate/proof
docsdependenciesstructsconstsfunctions

about

_mmu_gate.nx -- gate for the Sv39 PAGE-TABLE-WALK device (virtual-memory-paging-mmu). NO mocks. (1) WALK WORKS -- emits the MMU driver (via nx_drv_proto_emit) + runs it on the sovereign emu: it lays a Sv39 gigapage page table, programs satp, and the device WALKS the table -> the mapped VA 0xC0009000 translates to PA 0x80009000 ("MAP") and an unmapped VA faults ("FLT"). Serial must contain "MAPFLT" + a clean halt. (2) TAMPER device-base -- bump the device-base lui imm (byte 7): the MMU regs are missed, the walk never runs, "MAP" drops (the driver really talks to the MMU device). (3) TAMPER bad-PTE -- run the variant whose leaf PTE has V=0: the mapped VA walk FAULTS, the PADDR verify fails, "MAP" drops -> the Sv39 walk genuinely reads + validates the page table (translation is not a rubber stamp). Evidence -> knowledge/status/mmu.log (MMUGATE row). Sovereign. license_tier: ORIGINAL

dependencies 1 imports · 0 importers

nx_syscalls.nx _mmu_gate.nx

imports: nx_syscalls.nx

imported by: nobody (leaf or entry point)

call flow from main pre-order; caps 40 nodes / depth 6 declared; ↻ = already shown

main g_p sys_write sys_openat_append g_emit_run g_run sys_fork sys_openat_wr sys_dup3 sys_mmap sys_execve sys_exit sys_wait4 sys_mmap ↻ g_read sys_openat_rd sys_read sys_close g_has sys_mmap ↻ g_read ↻ sys_openat_wr ↻ sys_write ↻ sys_close ↻ g_run ↻ g_has_map sys_mmap ↻ g_read ↻ g_has ↻ g_fn sys_mmap ↻ sys_write ↻ g_fp sys_write ↻ sys_now_realtime_sec sys_mmap ↻ sys_clock_gettime_real sys_exit ↻

structs

none

consts

16const M_EMIT: *u8 = "_offc/nx_drv_proto_emit.elf"
17const M_SOV: *u8 = "_offc/nx_boot_run_sov.elf"
18const M_SPEC: *u8 = "knowledge/specs/drv_proto_mmu.spec"
19const M_BIN: *u8 = "runtime/_hdl_build/_drv_proto_mmu.bin"
20const M_BADSPEC: *u8 = "knowledge/specs/drv_proto_mmu_badpte.spec"
21const M_BADBIN: *u8 = "runtime/_hdl_build/_drv_proto_mmu_badpte.bin"

functions

23func g_p(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 }
called by 1: main calls 1: sys_write
24func g_fp(fd: i64, s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(fd,s,n); return 0 }
called by 1: main calls 1: sys_write
25func g_fn(fd: i64, v: i64) -> i64 { let bb: *u8=sys_mmap(28); var m: i64=v; if m<0{m=0-m}; let t: *u8=sys_mmap(28); var k: i64=0; if m==0{t[0]=48;k=1}; while m>0{t[k]=(48+(m%10)) as u8;m=m/10;k=k+1}; var i: i64=0; while i<k{bb[i]=t[k-1-i];i=i+1}; sys_write(fd,bb,k); return 0 }
called by 1: main calls 2: sys_mmapsys_write
27func g_run(prog: *u8, a1: *u8, outpath: *u8) -> i64
called by 2: g_emit_runmain calls 7: sys_forksys_openat_wrsys_dup3sys_mmapsys_execvesys_exit+1
48func g_read(path: *u8, buf: *u8, cap: i64) -> i64
called by 3: g_emit_rung_has_mapmain calls 3: sys_openat_rdsys_readsys_close
58func g_has(buf: *u8, n: i64, pat: *u8, pl: i64) -> i64
called by 2: g_emit_rung_has_map
65func g_emit_run(spec: *u8, bin: *u8, serial: *u8) -> i64
called by 1: main calls 4: g_runsys_mmapg_readg_has
75func g_has_map(serial: *u8) -> i64
called by 1: main calls 3: sys_mmapg_readg_has
80func main() -> i64
calls 14: g_psys_openat_appendg_emit_runsys_mmapg_readsys_openat_wr+8