| Message ID | 20200322205439.15231-2-nieklinnenbank@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
On Sun, 22 Mar 2020 at 20:54, Niek Linnenbank <nieklinnenbank@gmail.com> wrote: > > The allwinner_h3_dramc_map_rows function simulates row addressing behavior > when bootloader software attempts to detect the amount of available SDRAM. > > Currently the line that calculates the 64-bit address of the mirrored row > uses a signed 32-bit multiply operation that in theory could result in the > upper 32-bit be all 1s. This commit ensures that the row mirror address > is calculated using only 64-bit operations. > > Reported-by: Peter Maydell <peter.maydell@linaro.org> > Signed-off-by: Niek Linnenbank <nieklinnenbank@gmail.com> > --- > hw/misc/allwinner-h3-dramc.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/hw/misc/allwinner-h3-dramc.c b/hw/misc/allwinner-h3-dramc.c > index 2b5260260e..f9f05b5384 100644 > --- a/hw/misc/allwinner-h3-dramc.c > +++ b/hw/misc/allwinner-h3-dramc.c > @@ -85,8 +85,8 @@ static void allwinner_h3_dramc_map_rows(AwH3DramCtlState *s, uint8_t row_bits, > > } else if (row_bits_actual) { > /* Row bits not matching ram_size, install the rows mirror */ > - hwaddr row_mirror = s->ram_addr + ((1 << (row_bits_actual + > - bank_bits)) * page_size); > + hwaddr row_mirror = s->ram_addr + ((1UL << (row_bits_actual + > + bank_bits)) * page_size); This needs to be a "ULL" suffix... (I just sent a different email with the rationale). thanks -- PMM
Hi Peter, On Sun, Mar 22, 2020 at 10:18 PM Peter Maydell <peter.maydell@linaro.org> wrote: > On Sun, 22 Mar 2020 at 20:54, Niek Linnenbank <nieklinnenbank@gmail.com> > wrote: > > > > The allwinner_h3_dramc_map_rows function simulates row addressing > behavior > > when bootloader software attempts to detect the amount of available > SDRAM. > > > > Currently the line that calculates the 64-bit address of the mirrored row > > uses a signed 32-bit multiply operation that in theory could result in > the > > upper 32-bit be all 1s. This commit ensures that the row mirror address > > is calculated using only 64-bit operations. > > > > Reported-by: Peter Maydell <peter.maydell@linaro.org> > > Signed-off-by: Niek Linnenbank <nieklinnenbank@gmail.com> > > --- > > hw/misc/allwinner-h3-dramc.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/hw/misc/allwinner-h3-dramc.c b/hw/misc/allwinner-h3-dramc.c > > index 2b5260260e..f9f05b5384 100644 > > --- a/hw/misc/allwinner-h3-dramc.c > > +++ b/hw/misc/allwinner-h3-dramc.c > > @@ -85,8 +85,8 @@ static void > allwinner_h3_dramc_map_rows(AwH3DramCtlState *s, uint8_t row_bits, > > > > } else if (row_bits_actual) { > > /* Row bits not matching ram_size, install the rows mirror */ > > - hwaddr row_mirror = s->ram_addr + ((1 << (row_bits_actual + > > - bank_bits)) * > page_size); > > + hwaddr row_mirror = s->ram_addr + ((1UL << (row_bits_actual + > > + bank_bits)) * > page_size); > > This needs to be a "ULL" suffix... (I just sent a different email > with the rationale). > Ah ofcourse, it should be ULL indeed. And I can't think of any reason why I made this mistake. I simply overlooked it, thanks. I'm resending this patch with the proper ULL suffix. Regards, Niek > > thanks > -- PMM >
diff --git a/hw/misc/allwinner-h3-dramc.c b/hw/misc/allwinner-h3-dramc.c index 2b5260260e..f9f05b5384 100644 --- a/hw/misc/allwinner-h3-dramc.c +++ b/hw/misc/allwinner-h3-dramc.c @@ -85,8 +85,8 @@ static void allwinner_h3_dramc_map_rows(AwH3DramCtlState *s, uint8_t row_bits, } else if (row_bits_actual) { /* Row bits not matching ram_size, install the rows mirror */ - hwaddr row_mirror = s->ram_addr + ((1 << (row_bits_actual + - bank_bits)) * page_size); + hwaddr row_mirror = s->ram_addr + ((1UL << (row_bits_actual + + bank_bits)) * page_size); memory_region_set_enabled(&s->row_mirror_alias, true); memory_region_set_address(&s->row_mirror_alias, row_mirror);
The allwinner_h3_dramc_map_rows function simulates row addressing behavior when bootloader software attempts to detect the amount of available SDRAM. Currently the line that calculates the 64-bit address of the mirrored row uses a signed 32-bit multiply operation that in theory could result in the upper 32-bit be all 1s. This commit ensures that the row mirror address is calculated using only 64-bit operations. Reported-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Niek Linnenbank <nieklinnenbank@gmail.com> --- hw/misc/allwinner-h3-dramc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)