_mmu_gate.nx

buildroot/runtime/_hdl_build/_mmu_gate.nx

11540 B204 linesdepth 3pulls 3 transitivereach 0 importersview sourcekind gate/proof

docs dependencies structs consts functions

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 2 imports · 0 importers

imports: nx_syscalls.nxnx_gate_verdict.nx

imported by: nobody (leaf or entry point)

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

structs

none

consts

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

functions

24	func 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
25	func 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
26	func g_fn(fd: i64, v: i64) -> i64 { let bb: u8=sys_mmap(28); var m: i64=v; if m<0{m=0-m;sys_write(fd,"-" as u8,1)}; 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_mmap sys_write
28	func g_run(prog: u8, a1: u8, outpath: *u8) -> i64 called by 2: g_emit_run main calls 7: sys_fork sys_openat_wr sys_dup3 sys_mmap sys_execve sys_exit+1
49	func g_read(path: u8, buf: u8, cap: i64) -> i64 called by 3: g_emit_run g_serial_has main calls 3: sys_openat_rd sys_read sys_close
59	func g_has(buf: u8, n: i64, pat: u8, pl: i64) -> i64 called by 1: g_emit_run
66	func g_emit_run(spec: u8, bin: u8, serial: *u8) -> i64 called by 1: main calls 4: g_run sys_mmap g_read g_has
89	func g_serial_has(serial: u8, pat: u8, pl: i64) -> i64 called by 1: g_has_map calls 2: sys_mmap g_read
125	func g_has_map(serial: *u8) -> i64 called by 1: main calls 1: g_serial_has
129	func main() -> i64 calls 17: g_p sys_openat_append g_emit_run sys_mmap g_read sys_openat_wr+11