Re: [RESEND PATCH 1/1] ArmPlatformPkg/ArmTrustZone: Add support for specifying Subregions to be disabled

[Bhupesh Sharma <bhupesh.sharma@nxp.com>]

Hi Ard, Leif,

Any comments on this patch ?

> From: Bhupesh Sharma [mailto:bhupesh.sharma@nxp.com]
> Sent: Friday, October 14, 2016 4:40 PM
> 
> ARM TZASC-380 IP provides a mechanism to split memory regions being
> protected via it into eight equal-sized sub-regions, with a bit setting
> allowing the corresponding subregion to be disabled.
> 
> Several NXP/FSL SoCs support the TZASC-380 IP block and allow the DDR
> connected via the TZASC to be partitioned into regions having different
> security settings.
> 
> This patch enables this support and can be used for SoCs which support
> such partition of DDR regions.
> 
> Details of the 'subregion_disable' register can be viewed here:
> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0431c/CJ
> ABCFHB.html
> 
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@nxp.com>
> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  .../Library/ArmVExpressSecLibCTA9x4/CTA9x4Sec.c     | 21
> ++++++++++++++-------
>  ArmPlatformPkg/Drivers/ArmTrustZone/ArmTrustZone.c  |  5 +++--
>  ArmPlatformPkg/Include/Drivers/ArmTrustzone.h       |  3 ++-
>  3 files changed, 19 insertions(+), 10 deletions(-)
> 
> diff --git
> a/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressSecLibCTA9x4/CTA9x4S
> ec.c
> b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressSecLibCTA9x4/CTA9x4S
> ec.c
> index 6fa0774..d358d65 100644
> ---
> a/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressSecLibCTA9x4/CTA9x4S
> ec.c
> +++
> b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressSecLibCTA9x4/CTA9
> +++ x4Sec.c
> @@ -72,18 +72,21 @@ ArmPlatformSecTrustzoneInit (
>    // NOR Flash 0 non secure (BootMon)
>    TZASCSetRegion(ARM_VE_TZASC_BASE,1,TZASC_REGION_ENABLED,
>        ARM_VE_SMB_NOR0_BASE,0,
> -      TZASC_REGION_SIZE_64MB, TZASC_REGION_SECURITY_NSRW);
> +      TZASC_REGION_SIZE_64MB, TZASC_REGION_SECURITY_NSRW,
> +      0);
> 
>    // NOR Flash 1. The first half of the NOR Flash1 must be secure for
> the secure firmware (sec_uefi.bin)
>    if (PcdGetBool (PcdTrustzoneSupport) == TRUE) {
>      //Note: Your OS Kernel must be aware of the secure regions before
> to enable this region
>      TZASCSetRegion(ARM_VE_TZASC_BASE,2,TZASC_REGION_ENABLED,
>          ARM_VE_SMB_NOR1_BASE + SIZE_32MB,0,
> -        TZASC_REGION_SIZE_32MB, TZASC_REGION_SECURITY_NSRW);
> +        TZASC_REGION_SIZE_32MB, TZASC_REGION_SECURITY_NSRW,
> +	0);
>    } else {
>      TZASCSetRegion(ARM_VE_TZASC_BASE,2,TZASC_REGION_ENABLED,
>          ARM_VE_SMB_NOR1_BASE,0,
> -        TZASC_REGION_SIZE_64MB, TZASC_REGION_SECURITY_NSRW);
> +        TZASC_REGION_SIZE_64MB, TZASC_REGION_SECURITY_NSRW,
> +	0);
>    }
> 
>    // Base of SRAM. Only half of SRAM in Non Secure world @@ -92,22
> +95,26 @@ ArmPlatformSecTrustzoneInit (
>      //Note: Your OS Kernel must be aware of the secure regions before
> to enable this region
>      TZASCSetRegion(ARM_VE_TZASC_BASE,3,TZASC_REGION_ENABLED,
>          ARM_VE_SMB_SRAM_BASE,0,
> -        TZASC_REGION_SIZE_16MB, TZASC_REGION_SECURITY_NSRW);
> +        TZASC_REGION_SIZE_16MB, TZASC_REGION_SECURITY_NSRW,
> +	0);
>    } else {
>      TZASCSetRegion(ARM_VE_TZASC_BASE,3,TZASC_REGION_ENABLED,
>          ARM_VE_SMB_SRAM_BASE,0,
> -        TZASC_REGION_SIZE_32MB, TZASC_REGION_SECURITY_NSRW);
> +        TZASC_REGION_SIZE_32MB, TZASC_REGION_SECURITY_NSRW,
> +	0);
>    }
> 
>    // Memory Mapped Peripherals. All in non secure world
>    TZASCSetRegion(ARM_VE_TZASC_BASE,4,TZASC_REGION_ENABLED,
>        ARM_VE_SMB_PERIPH_BASE,0,
> -      TZASC_REGION_SIZE_64MB, TZASC_REGION_SECURITY_NSRW);
> +      TZASC_REGION_SIZE_64MB, TZASC_REGION_SECURITY_NSRW,
> +      0);
> 
>    // MotherBoard Peripherals and On-chip peripherals.
>    TZASCSetRegion(ARM_VE_TZASC_BASE,5,TZASC_REGION_ENABLED,
>        ARM_VE_SMB_MB_ON_CHIP_PERIPH_BASE,0,
> -      TZASC_REGION_SIZE_256MB, TZASC_REGION_SECURITY_NSRW);
> +      TZASC_REGION_SIZE_256MB, TZASC_REGION_SECURITY_NSRW,
> +      0);
>  }
> 
>  /**
> diff --git a/ArmPlatformPkg/Drivers/ArmTrustZone/ArmTrustZone.c
> b/ArmPlatformPkg/Drivers/ArmTrustZone/ArmTrustZone.c
> index 070c0dc..5cd41ef 100644
> --- a/ArmPlatformPkg/Drivers/ArmTrustZone/ArmTrustZone.c
> +++ b/ArmPlatformPkg/Drivers/ArmTrustZone/ArmTrustZone.c
> @@ -87,7 +87,8 @@ TZASCSetRegion (
>    IN  UINTN LowAddress,
>    IN  UINTN HighAddress,
>    IN  UINTN Size,
> -  IN  UINTN Security
> +  IN  UINTN Security,
> +  IN  UINTN SubregionDisableMask
>    )
>  {
>    UINT32*     Region;
> @@ -100,7 +101,7 @@ TZASCSetRegion (
> 
>    MmioWrite32((UINTN)(Region), LowAddress&0xFFFF8000);
>    MmioWrite32((UINTN)(Region+1), HighAddress);
> -  MmioWrite32((UINTN)(Region+2), ((Security & 0xF) <<28) | ((Size &
> 0x3F) << 1) | (Enabled & 0x1));
> +  MmioWrite32((UINTN)(Region+2), ((Security & 0xF) <<28) |
> + ((SubregionDisableMask & 0xFF) << 8) | ((Size & 0x3F) << 1) |
> (Enabled
> + & 0x1));
> 
>    return EFI_SUCCESS;
>  }
> diff --git a/ArmPlatformPkg/Include/Drivers/ArmTrustzone.h
> b/ArmPlatformPkg/Include/Drivers/ArmTrustzone.h
> index 78e98aa..1ba963d 100644
> --- a/ArmPlatformPkg/Include/Drivers/ArmTrustzone.h
> +++ b/ArmPlatformPkg/Include/Drivers/ArmTrustzone.h
> @@ -82,7 +82,8 @@ TZASCSetRegion (
>    IN  UINTN LowAddress,
>    IN  UINTN HighAddress,
>    IN  UINTN Size,
> -  IN  UINTN Security
> +  IN  UINTN Security,
> +  IN  UINTN SubregionDisableMask
>    );
> 
>  #endif
> --
> 1.9.1
> 

Regards,
Bhupesh