_ctxsw_gate.nx

buildroot/runtime/_hdl_build/_ctxsw_gate.nx

4831 B88 linesdepth 2pulls 2 transitivereach 0 importersview sourcekind gate/proof

docs dependencies structs consts functions

about

_ctxsw_gate.nx -- LOCK for CONTEXT SWITCH between address spaces (satp swap, X-PAGE-CTXSW-001). NO mocks. Proves multiprocess virtual memory: the SAME virtual address (0xC0009000) reads DIFFERENT physical memory depending on the active page table, and swapping satp performs the switch. Drives nx_ctxsw_emit: T1 real-switch : 2nd satp = table B -> load VA(satp=A)=sentinel_A, swap, load VA(satp=B)=sentinel_B -> CSW T2 control : 2nd satp = table A (NO switch) -> both loads hit table A -> t4=sentinel_A!=sentinel_B -> CSW never prints (the swap is load-bearing: without it the VA can't read 2 values) GREEN only if T1 && T2. Evidence -> knowledge/status/priv.log (CTXSWGATE). 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

10	const CS_EMIT: *u8 = "_offc/nx_ctxsw_emit.elf"
11	const CS_SOV: *u8 = "_offc/nx_boot_run_sov.elf"

functions

13	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 2: g_row main calls 1: sys_write
14	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
15	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
17	func g_run(prog: u8, a1: u8, a2: u8, outpath: u8) -> i64 called by 1: g_case calls 7: sys_fork sys_openat_wr sys_dup3 sys_mmap sys_execve sys_exit+1
36	func g_read(path: u8, buf: u8, cap: i64) -> i64 called by 1: g_case calls 3: sys_openat_rd sys_read sys_close
45	func g_has(buf: u8, n: i64, pat: u8, pl: i64) -> i64 called by 1: main
51	func g_case(satp2: u8, binp: u8, txt: u8, buf: u8) -> i64 called by 1: main calls 2: g_run g_read
56	func g_row(name: u8, pass: i64) -> i64 { g_p(" " as u8); g_p(name); if pass==1 { g_p(" PASS\n" as u8) } else { g_p(" FAIL\n" as u8) } return 0 } called by 1: main calls 1: g_p
58	func main() -> i64 calls 11: sys_mmap g_case g_has g_p g_row sys_openat_append+5