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#!/usr/bin/env python3
"""Loader-side floor on cmd_buf_len. LOAD ONLY -- no invoke, so nothing can wedge."""
import glob, struct, sys
sys.path.insert(0,'/root/psp/hw')
from tinygrad import Device
import tinygrad.runtime.autogen.am.am as am
from ring_wrap import install
adev=Device["AMD"].iface.dev_impl; submit=install(adev.psp,adev)
ARENA=0x10000
def alloc(n):
pa=adev.mm.palloc(n,align=0x1000,zero=True,boot=False); return pa,adev.paddr2mc(pa)
base=open(glob.glob('/root/psp/contall/ta_27-0-0-25_f3acd768*')[0],'rb').read()
def tryload(L):
ap_,amc=alloc(0x80000); cp,cmc=alloc(ARENA)
n=(len(base)+3)&~3
adev.vram.view(ap_,n)[:]=base+b'\x00'*(n-len(base)); adev.gmc.flush_hdp()
c=am.struct_psp_gfx_cmd_resp(cmd_id=am.GFX_CMD_ID_LOAD_TA); t=c.cmd.cmd_load_ta
t.app_phy_addr_lo,t.app_phy_addr_hi=amc&0xFFFFFFFF,amc>>32; t.app_len=len(base)
t.cmd_buf_phy_addr_lo,t.cmd_buf_phy_addr_hi=cmc&0xFFFFFFFF,cmc>>32
t.cmd_buf_len=L
try: r=submit(c)
except Exception as e: return 'exc %s'%str(e)[:40]
st=r.resp.status&0xFFFFFFFF
return 'ok sid=%d'%r.resp.session_id if st==0 else '%#x'%st
for L in (4,8,0x10,0x20,0x30,0x40,0x80,0x100,0x200,0x400,0x800,0xC00,0xE00,0xF00,0xFFF,0x1000,0x2000):
print(' cmd_buf_len=%-8s -> %s' % (hex(L), tryload(L)), flush=True)
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