| Message ID | 20190610193215.23704-12-julien.grall@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | xen/arm64: Rework head.S to make it more compliant with the Arm Arm | expand |
On Mon, 10 Jun 2019, Julien Grall wrote: > Document the behavior and the main registers usage within enable_mmu(). > > Signed-off-by: Julien Grall <julien.grall@arm.com> > --- > xen/arch/arm/arm64/head.S | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S > index 7b92c1c8eb..d673f7c0d8 100644 > --- a/xen/arch/arm/arm64/head.S > +++ b/xen/arch/arm/arm64/head.S > @@ -583,6 +583,13 @@ virtphys_clash: > ret > ENDPROC(create_page_tables) > > +/* > + * Turn on the Data Cache and the MMU. The function will return on the ID > + * mapping. In other word, the caller is responsible to switch to the runtime > + * mapping. > + * > + * Clobbers x0 - x1 > + */ as it calls PRINT, shouldn't it be x0 - x3? > enable_mmu: > PRINT("- Turning on paging -\r\n") > > -- > 2.11.0 >
Hi Stefano, On 26/06/2019 02:03, Stefano Stabellini wrote: > On Mon, 10 Jun 2019, Julien Grall wrote: >> Document the behavior and the main registers usage within enable_mmu(). >> >> Signed-off-by: Julien Grall <julien.grall@arm.com> >> --- >> xen/arch/arm/arm64/head.S | 7 +++++++ >> 1 file changed, 7 insertions(+) >> >> diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S >> index 7b92c1c8eb..d673f7c0d8 100644 >> --- a/xen/arch/arm/arm64/head.S >> +++ b/xen/arch/arm/arm64/head.S >> @@ -583,6 +583,13 @@ virtphys_clash: >> ret >> ENDPROC(create_page_tables) >> >> +/* >> + * Turn on the Data Cache and the MMU. The function will return on the ID >> + * mapping. In other word, the caller is responsible to switch to the runtime >> + * mapping. >> + * >> + * Clobbers x0 - x1 >> + */ > > as it calls PRINT, shouldn't it be x0 - x3? You are right. I will update the comment. Cheers,
diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S index 7b92c1c8eb..d673f7c0d8 100644 --- a/xen/arch/arm/arm64/head.S +++ b/xen/arch/arm/arm64/head.S @@ -583,6 +583,13 @@ virtphys_clash: ret ENDPROC(create_page_tables) +/* + * Turn on the Data Cache and the MMU. The function will return on the ID + * mapping. In other word, the caller is responsible to switch to the runtime + * mapping. + * + * Clobbers x0 - x1 + */ enable_mmu: PRINT("- Turning on paging -\r\n")
Document the behavior and the main registers usage within enable_mmu(). Signed-off-by: Julien Grall <julien.grall@arm.com> --- xen/arch/arm/arm64/head.S | 7 +++++++ 1 file changed, 7 insertions(+)