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charset="utf-8" From: Janosch Frank If a blob provides a reset PSW then we should use it instead of branching to the PSW address and using our own mask. Signed-off-by: Janosch Frank Reviewed-by: Thomas Huth Message-Id: <20201006094249.50640-4-frankja@linux.ibm.com> [thuth: Use Elvis operator to shorten long line] Signed-off-by: Thomas Huth --- pc-bios/s390-ccw/bootmap.c | 6 ++++-- pc-bios/s390-ccw/jump2ipl.c | 26 +++++++++++++++++++------- pc-bios/s390-ccw/s390-ccw.h | 1 + 3 files changed, 24 insertions(+), 9 deletions(-) diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c index 73471801de..44df7d16af 100644 --- a/pc-bios/s390-ccw/bootmap.c +++ b/pc-bios/s390-ccw/bootmap.c @@ -273,7 +273,8 @@ static void run_eckd_boot_script(block_number_t bmt_blo= ck_nr, =20 IPL_assert(bms->entry[i].type =3D=3D BOOT_SCRIPT_EXEC, "Unknown script entry type"); - jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */ + write_reset_psw(bms->entry[i].address.load_address); /* no return */ + jump_to_IPL_code(0); /* no return */ } =20 static void ipl_eckd_cdl(void) @@ -527,7 +528,8 @@ static void zipl_run(ScsiBlockPtr *pte) IPL_assert(entry->component_type =3D=3D ZIPL_COMP_ENTRY_EXEC, "No EXEC= entry"); =20 /* should not return */ - jump_to_IPL_code(entry->compdat.load_psw & PSW_MASK_SHORT_ADDR); + write_reset_psw(entry->compdat.load_psw); + jump_to_IPL_code(0); } =20 static void ipl_scsi(void) diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c index b6aad32def..fbae45b03c 100644 --- a/pc-bios/s390-ccw/jump2ipl.c +++ b/pc-bios/s390-ccw/jump2ipl.c @@ -12,15 +12,21 @@ =20 #define KERN_IMAGE_START 0x010000UL #define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_64) +#define RESET_PSW ((uint64_t)&jump_to_IPL_addr | RESET_PSW_MASK) =20 static uint64_t *reset_psw =3D 0, save_psw, ipl_continue; =20 +void write_reset_psw(uint64_t psw) +{ + *reset_psw =3D psw; +} + static void jump_to_IPL_addr(void) { __attribute__((noreturn)) void (*ipl)(void) =3D (void *)ipl_continue; =20 /* Restore reset PSW */ - *reset_psw =3D save_psw; + write_reset_psw(save_psw); =20 ipl(); /* should not return */ @@ -43,11 +49,12 @@ void jump_to_IPL_code(uint64_t address) * content of non-BIOS memory after we loaded the guest, so we * save the original content and restore it in jump_to_IPL_2. */ - save_psw =3D *reset_psw; - *reset_psw =3D (uint64_t) &jump_to_IPL_addr; - *reset_psw |=3D RESET_PSW_MASK; - ipl_continue =3D address; - debug_print_int("set IPL addr to", ipl_continue); + if (address) { + save_psw =3D *reset_psw; + write_reset_psw(RESET_PSW); + ipl_continue =3D address; + } + debug_print_int("set IPL addr to", address ?: *reset_psw & PSW_MASK_SH= ORT_ADDR); =20 /* Ensure the guest output starts fresh */ sclp_print("\n"); @@ -77,7 +84,12 @@ void jump_to_low_kernel(void) =20 /* Trying to get PSW at zero address */ if (*((uint64_t *)0) & RESET_PSW_MASK) { - jump_to_IPL_code((*((uint64_t *)0)) & PSW_MASK_SHORT_ADDR); + /* + * Surely nobody will try running directly from lowcore, so + * let's use 0 as an indication that we want to load the reset + * psw at 0x0 and not jump to the entry. + */ + jump_to_IPL_code(0); } =20 /* No other option left, so use the Linux kernel start address */ diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h index 9b86c120b4..6cd92669e9 100644 --- a/pc-bios/s390-ccw/s390-ccw.h +++ b/pc-bios/s390-ccw/s390-ccw.h @@ -76,6 +76,7 @@ int virtio_read(ulong sector, void *load_addr); void zipl_load(void); =20 /* jump2ipl.c */ +void write_reset_psw(uint64_t psw); void jump_to_IPL_code(uint64_t address); void jump_to_low_kernel(void); =20 --=20 2.18.2