== reachability: IS_ENABLED(CONFIG_AGP) with the radeon module's exact build flags ==
const char *agp = "AGP_DISABLED";
const char *pci = "PCI_ENABLED";
const char *undef_ = "UNDEF_DISABLED";
const char *cik = "CIK_ENABLED";

== impact arithmetic (radeon_agp.c:245-247 as written) ==
aper= 32M base=0xd0000000 -> gtt_size=0x0000200000000000 (32 TB) gtt_end=0x00002000cfffffff | AIC_HI_ADDR=0xcfffffff MC_AGP_TOP=0x2000cfff (START=0x0000d000)
aper= 64M base=0xd0000000 -> gtt_size=0x0000400000000000 (64 TB) gtt_end=0x00004000cfffffff | AIC_HI_ADDR=0xcfffffff MC_AGP_TOP=0x4000cfff (START=0x0000d000)
aper=128M base=0xd0000000 -> gtt_size=0x0000800000000000 (128 TB) gtt_end=0x00008000cfffffff | AIC_HI_ADDR=0xcfffffff MC_AGP_TOP=0x8000cfff (START=0x0000d000)
aper=256M base=0xd0000000 -> gtt_size=0x0001000000000000 (256 TB) gtt_end=0x00010000cfffffff | AIC_HI_ADDR=0xcfffffff MC_AGP_TOP=0x0000cfff (START=0x0000d000)
aper= 32M base=0xe0000000 -> gtt_size=0x0000200000000000 (32 TB) gtt_end=0x00002000dfffffff | AIC_HI_ADDR=0xdfffffff MC_AGP_TOP=0x2000dfff (START=0x0000e000)
aper= 64M base=0xe0000000 -> gtt_size=0x0000400000000000 (64 TB) gtt_end=0x00004000dfffffff | AIC_HI_ADDR=0xdfffffff MC_AGP_TOP=0x4000dfff (START=0x0000e000)
aper=128M base=0xe0000000 -> gtt_size=0x0000800000000000 (128 TB) gtt_end=0x00008000dfffffff | AIC_HI_ADDR=0xdfffffff MC_AGP_TOP=0x8000dfff (START=0x0000e000)
aper=256M base=0xe0000000 -> gtt_size=0x0001000000000000 (256 TB) gtt_end=0x00010000dfffffff | AIC_HI_ADDR=0xdfffffff MC_AGP_TOP=0x0000dfff (START=0x0000e000)
aper= 32M base=0xc0000000 -> gtt_size=0x0000200000000000 (32 TB) gtt_end=0x00002000bfffffff | AIC_HI_ADDR=0xbfffffff MC_AGP_TOP=0x2000bfff (START=0x0000c000)
aper= 64M base=0xc0000000 -> gtt_size=0x0000400000000000 (64 TB) gtt_end=0x00004000bfffffff | AIC_HI_ADDR=0xbfffffff MC_AGP_TOP=0x4000bfff (START=0x0000c000)
aper=128M base=0xc0000000 -> gtt_size=0x0000800000000000 (128 TB) gtt_end=0x00008000bfffffff | AIC_HI_ADDR=0xbfffffff MC_AGP_TOP=0x8000bfff (START=0x0000c000)
aper=256M base=0xc0000000 -> gtt_size=0x0001000000000000 (256 TB) gtt_end=0x00010000bfffffff | AIC_HI_ADDR=0xbfffffff MC_AGP_TOP=0x0000bfff (START=0x0000c000)

== hardware absence on this guest ==
       7
NO_AGP_OR_ATI_HARDWARE
NO_DRM_MODULES_LOADED