code wiki / _hdl_build / _paging_gate.nx

_paging_gate.nx

buildroot/runtime/_hdl_build/_paging_gate.nx

5287 B91 linesdepth 2pulls 2 transitivereach 0 importersview sourcekind gate/proof

docs dependencies structs consts functions

about

_paging_gate.nx -- gate for CPU-DATAPATH Sv39 PAGING (virtual-memory-paging-mmu integration). NO mocks. (1) TRANSPARENT TRANSLATION -- emits the paging test (nx_paging_emit) + runs it on the sovereign emu: after csrrw satp (MODE=Sv39), a NORMAL lw from VIRTUAL 0xC0009000 is transparently translated by the CPU through the page table to PHYSICAL 0x80009000 and reads the sentinel -> "VOK". VA (0xC0009000) != PA (0x80009000), so this is a real translation, not identity. (2) TAMPER bad-PTE -- re-emit with the leaf PTE's Valid bit cleared (0x20000006): the VA walk fails -> the load no longer reaches the sentinel -> "VOK" drops -> the CPU datapath genuinely walks + validates the page table on every access (translation is not a rubber stamp). Evidence -> knowledge/status/paging.log (PAGINGGATE row). Sovereign. license_tier: ORIGINAL

dependencies 1 imports · 0 importers

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

structs

none

consts

14	const P_EMIT: *u8 = "_offc/nx_paging_emit.elf"
15	const P_SOV: *u8 = "_offc/nx_boot_run_sov.elf"
16	const P_BIN: *u8 = "runtime/_hdl_build/_paging_virt.bin"

functions

18	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
19	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
20	func 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_mmap sys_write
22	func g_run(prog: u8, a1: u8, a2: u8, outpath: u8) -> i64 called by 1: main calls 7: sys_fork sys_openat_wr sys_dup3 sys_mmap sys_execve sys_exit+1
43	func g_read(path: u8, buf: u8, cap: i64) -> i64 called by 1: main calls 3: sys_openat_rd sys_read sys_close
52	func g_has(buf: u8, n: i64, pat: u8, pl: i64) -> i64 called by 1: main
59	func main() -> i64 calls 11: g_p sys_openat_append g_run sys_mmap g_read g_has+5