On Mon, 2015-11-16 at 08:34 -0800, York Sun wrote: > Secure memory is at the end of memory, separated and reserved > from OS, tracked by gd->secure_ram. Secure memory can host > MMU tables, security monitor, etc.
Don't see the difference with pram here? Also, do you really wan't to hide the memory from Linux or will a resv map do? You get a lot of small TLB maps if memory is non power of 2 Jocke > > Signed-off-by: York Sun <york...@freescale.com> > > --- > > Changes in v4: None > Changes in v3: > Put ifdef around secure_ram > Move defining CONFIG_SYS_MEM_RESERVE_SECURE to patch 2/2 > > Changes in v2: > Do not use CONFIG_SYS_MEM_TOP_HIDE mechanism > > Changes in v1: > Initial patch. > Depends on http://patchwork.ozlabs.org/patch/540248/ > > README | 8 ++++++++ > common/board_f.c | 9 +++++++++ > include/asm-generic/global_data.h | 4 ++++ > 3 files changed, 21 insertions(+) > > diff --git a/README b/README > index ef8d437..61cbc82 100644 > --- a/README > +++ b/README > @@ -3881,6 +3881,14 @@ Configuration Settings: > Scratch address used by the alternate memory test > You only need to set this if address zero isn't writeable > > +- CONFIG_SYS_MEM_RESERVE_SECURE > + If defined, the size of CONFIG_SYS_MEM_RESERVE_SECURE memory > + is substracted from total RAM and won't be reported to OS. > + This memory can be used as secure memory. A variable > + gd->secure_ram is used to track the location. In systems > + the RAM base is not zero, or RAM is divided into banks, > + this variable needs to be recalcuated to get the address. > + > - CONFIG_SYS_MEM_TOP_HIDE (PPC only): > If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config > header, > this specified memory area will get subtracted from the top > diff --git a/common/board_f.c b/common/board_f.c > index 725eb18..8061105 100644 > --- a/common/board_f.c > +++ b/common/board_f.c > @@ -323,6 +323,15 @@ static int setup_dest_addr(void) > * Ram is setup, size stored in gd !! > */ > debug("Ram size: %08lX\n", (ulong)gd->ram_size); > +#ifdef CONFIG_SYS_MEM_RESERVE_SECURE > + /* Reserve memory for secure MMU tables, and/or security monitor */ > + gd->ram_size -= CONFIG_SYS_MEM_RESERVE_SECURE; > + /* > + * Record secure memory location. Need recalcuate if memory splits > + * into banks, or the ram base is not zero. > + */ > + gd->secure_ram = gd->ram_size; > +#endif > #if defined(CONFIG_SYS_MEM_TOP_HIDE) > /* > * Subtract specified amount of memory to hide so that it won't > diff --git a/include/asm-generic/global_data.h > b/include/asm-generic/global_data.h > index d0383f3..8cdafd6 100644 > --- a/include/asm-generic/global_data.h > +++ b/include/asm-generic/global_data.h > @@ -58,6 +58,10 @@ typedef struct global_data { > > unsigned long relocaddr; /* Start address of U-Boot in RAM */ > phys_size_t ram_size; /* RAM size */ > +#ifdef CONFIG_SYS_MEM_RESERVE_SECURE > + /* Secure memory addr. LSB is a flag for "secured". */ > + phys_addr_t secure_ram; > +#endif > unsigned long mon_len; /* monitor len */ > unsigned long irq_sp; /* irq stack pointer */ > unsigned long start_addr_sp; /* start_addr_stackpointer */ _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
