| Message ID | 20170630155431.23824-11-julien.grall@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Julien, On 06/30/2017 05:54 PM, Julien Grall wrote: > Also adding one missing full stop + fix description > > Signed-off-by: Julien Grall <julien.grall@arm.com> > Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> > --- > > Cc: proskurin@sec.in.tum.de > > I haven't retained Stefano's reviewed-by because of the description > update. > > Changes in v2: > - Fix description regarding x86 page-table > > Changes in v3: > - Add Stefano's reviewed-by Reviewed-by: Sergej Proskurin <proskurin@sec.in.tum.de> > --- > xen/include/asm-arm/lpae.h | 49 ++++++++++++++++++++++++++++++---------------- > 1 file changed, 32 insertions(+), 17 deletions(-) > > diff --git a/xen/include/asm-arm/lpae.h b/xen/include/asm-arm/lpae.h > index ad8c571ea5..aa85cb8112 100644 > --- a/xen/include/asm-arm/lpae.h > +++ b/xen/include/asm-arm/lpae.h > @@ -3,10 +3,12 @@ > > #ifndef __ASSEMBLY__ > > -/* WARNING! Unlike the Intel pagetable code, where l1 is the lowest > - * level and l4 is the root of the trie, the ARM pagetables follow ARM's > - * documentation: the levels are called first, second &c in the order > - * that the MMU walks them (i.e. "first" is the root of the trie). */ > +/* > + * WARNING! Unlike the x86 pagetable code, where l1 is the lowest level and > + * l4 is the root of the trie, the ARM pagetables follow ARM's documentation: > + * the levels are called first, second &c in the order that the MMU walks them > + * (i.e. "first" is the root of the trie). > + */ > > /****************************************************************************** > * ARMv7-A LPAE pagetables: 3-level trie, mapping 40-bit input to > @@ -17,15 +19,18 @@ > * different place from those in leaf nodes seems to be to allow linear > * pagetable tricks. If we're not doing that then the set of permission > * bits that's not in use in a given node type can be used as > - * extra software-defined bits. */ > + * extra software-defined bits. > + */ > > typedef struct __packed { > /* These are used in all kinds of entry. */ > unsigned long valid:1; /* Valid mapping */ > unsigned long table:1; /* == 1 in 4k map entries too */ > > - /* These ten bits are only used in Block entries and are ignored > - * in Table entries. */ > + /* > + * These ten bits are only used in Block entries and are ignored > + * in Table entries. > + */ > unsigned long ai:3; /* Attribute Index */ > unsigned long ns:1; /* Not-Secure */ > unsigned long user:1; /* User-visible */ > @@ -38,30 +43,38 @@ typedef struct __packed { > unsigned long long base:36; /* Base address of block or next table */ > unsigned long sbz:4; /* Must be zero */ > > - /* These seven bits are only used in Block entries and are ignored > - * in Table entries. */ > + /* > + * These seven bits are only used in Block entries and are ignored > + * in Table entries. > + */ > unsigned long contig:1; /* In a block of 16 contiguous entries */ > unsigned long pxn:1; /* Privileged-XN */ > unsigned long xn:1; /* eXecute-Never */ > unsigned long avail:4; /* Ignored by hardware */ > > - /* These 5 bits are only used in Table entries and are ignored in > - * Block entries */ > + /* > + * These 5 bits are only used in Table entries and are ignored in > + * Block entries. > + */ > unsigned long pxnt:1; /* Privileged-XN */ > unsigned long xnt:1; /* eXecute-Never */ > unsigned long apt:2; /* Access Permissions */ > unsigned long nst:1; /* Not-Secure */ > } lpae_pt_t; > > -/* The p2m tables have almost the same layout, but some of the permission > - * and cache-control bits are laid out differently (or missing) */ > +/* > + * The p2m tables have almost the same layout, but some of the permission > + * and cache-control bits are laid out differently (or missing). > + */ > typedef struct __packed { > /* These are used in all kinds of entry. */ > unsigned long valid:1; /* Valid mapping */ > unsigned long table:1; /* == 1 in 4k map entries too */ > > - /* These ten bits are only used in Block entries and are ignored > - * in Table entries. */ > + /* > + * These ten bits are only used in Block entries and are ignored > + * in Table entries. > + */ > unsigned long mattr:4; /* Memory Attributes */ > unsigned long read:1; /* Read access */ > unsigned long write:1; /* Write access */ > @@ -73,8 +86,10 @@ typedef struct __packed { > unsigned long long base:36; /* Base address of block or next table */ > unsigned long sbz3:4; > > - /* These seven bits are only used in Block entries and are ignored > - * in Table entries. */ > + /* > + * These seven bits are only used in Block entries and are ignored > + * in Table entries. > + */ > unsigned long contig:1; /* In a block of 16 contiguous entries */ > unsigned long sbz2:1; > unsigned long xn:1; /* eXecute-Never */ >
diff --git a/xen/include/asm-arm/lpae.h b/xen/include/asm-arm/lpae.h index ad8c571ea5..aa85cb8112 100644 --- a/xen/include/asm-arm/lpae.h +++ b/xen/include/asm-arm/lpae.h @@ -3,10 +3,12 @@ #ifndef __ASSEMBLY__ -/* WARNING! Unlike the Intel pagetable code, where l1 is the lowest - * level and l4 is the root of the trie, the ARM pagetables follow ARM's - * documentation: the levels are called first, second &c in the order - * that the MMU walks them (i.e. "first" is the root of the trie). */ +/* + * WARNING! Unlike the x86 pagetable code, where l1 is the lowest level and + * l4 is the root of the trie, the ARM pagetables follow ARM's documentation: + * the levels are called first, second &c in the order that the MMU walks them + * (i.e. "first" is the root of the trie). + */ /****************************************************************************** * ARMv7-A LPAE pagetables: 3-level trie, mapping 40-bit input to @@ -17,15 +19,18 @@ * different place from those in leaf nodes seems to be to allow linear * pagetable tricks. If we're not doing that then the set of permission * bits that's not in use in a given node type can be used as - * extra software-defined bits. */ + * extra software-defined bits. + */ typedef struct __packed { /* These are used in all kinds of entry. */ unsigned long valid:1; /* Valid mapping */ unsigned long table:1; /* == 1 in 4k map entries too */ - /* These ten bits are only used in Block entries and are ignored - * in Table entries. */ + /* + * These ten bits are only used in Block entries and are ignored + * in Table entries. + */ unsigned long ai:3; /* Attribute Index */ unsigned long ns:1; /* Not-Secure */ unsigned long user:1; /* User-visible */ @@ -38,30 +43,38 @@ typedef struct __packed { unsigned long long base:36; /* Base address of block or next table */ unsigned long sbz:4; /* Must be zero */ - /* These seven bits are only used in Block entries and are ignored - * in Table entries. */ + /* + * These seven bits are only used in Block entries and are ignored + * in Table entries. + */ unsigned long contig:1; /* In a block of 16 contiguous entries */ unsigned long pxn:1; /* Privileged-XN */ unsigned long xn:1; /* eXecute-Never */ unsigned long avail:4; /* Ignored by hardware */ - /* These 5 bits are only used in Table entries and are ignored in - * Block entries */ + /* + * These 5 bits are only used in Table entries and are ignored in + * Block entries. + */ unsigned long pxnt:1; /* Privileged-XN */ unsigned long xnt:1; /* eXecute-Never */ unsigned long apt:2; /* Access Permissions */ unsigned long nst:1; /* Not-Secure */ } lpae_pt_t; -/* The p2m tables have almost the same layout, but some of the permission - * and cache-control bits are laid out differently (or missing) */ +/* + * The p2m tables have almost the same layout, but some of the permission + * and cache-control bits are laid out differently (or missing). + */ typedef struct __packed { /* These are used in all kinds of entry. */ unsigned long valid:1; /* Valid mapping */ unsigned long table:1; /* == 1 in 4k map entries too */ - /* These ten bits are only used in Block entries and are ignored - * in Table entries. */ + /* + * These ten bits are only used in Block entries and are ignored + * in Table entries. + */ unsigned long mattr:4; /* Memory Attributes */ unsigned long read:1; /* Read access */ unsigned long write:1; /* Write access */ @@ -73,8 +86,10 @@ typedef struct __packed { unsigned long long base:36; /* Base address of block or next table */ unsigned long sbz3:4; - /* These seven bits are only used in Block entries and are ignored - * in Table entries. */ + /* + * These seven bits are only used in Block entries and are ignored + * in Table entries. + */ unsigned long contig:1; /* In a block of 16 contiguous entries */ unsigned long sbz2:1; unsigned long xn:1; /* eXecute-Never */