Hi Heinrich, On Sun, 12 Nov 2023 at 13:16, Heinrich Schuchardt <heinrich.schucha...@canonical.com> wrote: > > > > Simon Glass <s...@chromium.org> schrieb am So., 12. Nov. 2023, 21:03: >> >> Hi Heinrich, >> >> On Sat, 11 Nov 2023 at 07:28, Heinrich Schuchardt >> <heinrich.schucha...@canonical.com> wrote: >> > >> > The field RsdtAddress has only 32 bit. The RSDT table cannot be located >> > beyond 4 GiB. >> > >> > Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com> >> > --- >> > lib/acpi/base.c | 26 +++++++++++++++++++------- >> > 1 file changed, 19 insertions(+), 7 deletions(-) >> >> Reviewed-by: Simon Glass <s...@chromium.org> >> >> nits / question below >> >> > >> > diff --git a/lib/acpi/base.c b/lib/acpi/base.c >> > index 2057bd2bef..128a76ad39 100644 >> > --- a/lib/acpi/base.c >> > +++ b/lib/acpi/base.c >> > @@ -21,10 +21,17 @@ void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct >> > acpi_rsdt *rsdt, >> > memcpy(rsdp->signature, RSDP_SIG, 8); >> > memcpy(rsdp->oem_id, OEM_ID, 6); >> > >> > - rsdp->length = sizeof(struct acpi_rsdp); >> > - rsdp->rsdt_address = map_to_sysmem(rsdt); >> > + if (rsdt) >> > + rsdp->rsdt_address = map_to_sysmem(rsdt); >> > + else >> > + rsdp->rsdt_address = 0; >> >> There is a memset() at the top so this line (and the one below) should >> not be needed. >> >> > + >> > + if (xsdt) >> > + rsdp->xsdt_address = map_to_sysmem(xsdt); >> > + else >> > + rsdp->xsdt_address = 0; >> > >> > - rsdp->xsdt_address = map_to_sysmem(xsdt); >> > + rsdp->length = sizeof(struct acpi_rsdp); >> > rsdp->revision = ACPI_RSDP_REV_ACPI_2_0; >> > >> > /* Calculate checksums */ >> > @@ -68,11 +75,15 @@ static void acpi_write_xsdt(struct acpi_xsdt *xsdt) >> > static int acpi_write_base(struct acpi_ctx *ctx, >> > const struct acpi_writer *entry) >> > { >> > - /* We need at least an RSDP and an RSDT Table */ >> > + /* We need at least an RSDP and an XSDT Table */ >> > ctx->rsdp = ctx->current; >> > acpi_inc_align(ctx, sizeof(struct acpi_rsdp)); >> > - ctx->rsdt = ctx->current; >> > - acpi_inc_align(ctx, sizeof(struct acpi_rsdt)); >> > + if (map_to_sysmem(ctx->current) < UINT_MAX - 0x10000) { >> >> Won't that do something different on 64-bit machines? It seems that >> you want to check against SZ_4G ? > > > For gcc int is 32bit on 64bit systems, so is UINT_MAX. Using SZ_4G could make > this code clearer.
Oh I didn't know that...I just assumed that uint would be 64-bit on a 64-machine machine, since it is the natural reg size! Yes, that is very very confusing. I vaguely recall some compiler setting for that and that Linux did it a particular way. > > Best regards > > Heinrich > > >> >> > + ctx->rsdt = ctx->current; >> > + acpi_inc_align(ctx, sizeof(struct acpi_rsdt)); >> > + } else { >> > + ctx->rsdt = 0; >> > + } >> > ctx->xsdt = ctx->current; >> > acpi_inc_align(ctx, sizeof(struct acpi_xsdt)); >> > >> > @@ -80,7 +91,8 @@ static int acpi_write_base(struct acpi_ctx *ctx, >> > memset(ctx->base, '\0', ctx->current - ctx->base); >> > >> > acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt); >> > - acpi_write_rsdt(ctx->rsdt); >> > + if (ctx->rsdt) >> > + acpi_write_rsdt(ctx->rsdt); >> > acpi_write_xsdt(ctx->xsdt); >> > >> > return 0; >> > -- >> > 2.40.1 >> > >> >> Regards, >> Simon