core: Refactor console_init() and introduce plat_console_init()

Since there are some cross-platform console drivers, we let
console_init() be common code to have a chance to initialize those
console

core: Refactor console_init() and introduce plat_console_init()

Since there are some cross-platform console drivers, we let
console_init() be common code to have a chance to initialize those
console drivers (e.g., semihosting console).

If the cross-platform console drivers are not configured to be compiled,
plat_console_init() will be invoked to initialize platform-specific
console driver.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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Add SPDX license identifiers

Adds one SPDX-License-Identifier line [1] to each source files that
contains license text.

Generated by [2]:
spdxify.py --add-spdx optee_os/

The scancode tool [3] wa

Add SPDX license identifiers

Adds one SPDX-License-Identifier line [1] to each source files that
contains license text.

Generated by [2]:
spdxify.py --add-spdx optee_os/

The scancode tool [3] was used to double check the license matching
code in the Python script. All the licenses detected by scancode are
either detected by spdxify.py, or have no SPDX identifier, or are false
matches.

Link: [1] https://spdx.org/licenses/
Link: [2] https://github.com/jforissier/misc/blob/f7b56c8/spdxify.py
Link: [3] https://github.com/nexB/scancode-toolkit
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Joakim Bech <joakim.bech@linaro.org>

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core: remove __early_bss

Initialize the .bss section early from assembler before entering C
code. As a result, the __early_bss qualifier is not needed anymore.
Remove it, as well as the related symb

core: remove __early_bss

Initialize the .bss section early from assembler before entering C
code. As a result, the __early_bss qualifier is not needed anymore.
Remove it, as well as the related symbols (__early_bss_start and
__early_bss_end).

This makes the code simpler hence easier to maintain, at the expense
of initialization time, since .bss is cleared before CPU caches are
turned on (and doing it later would mean some C function have been
called already). Here are some performance numbers measured on HiKey.
The "memset" column measures the time it takes to clear .bss in C,
without this patch. The "assembly" column reports the time taken by the
clear_bss loop in this patch. Timings were performed using CNTPCT.
Worst case is a ~1 ms overhead in boot time.

memset(): | assembly:
ms (bytes) | ms (bytes)
--------------+--------------
Aarch64 0.30 (72824) | 0.08 (73528)
Aarch32 0.27 (65016) | 1.24 (65408)
Aarch32/pager 0.03 (11328) | 0.23 (11736)

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (QEMU)
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (HiKey 32/64)
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (HiKey/pager)
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: add common implementation for console_putc() and console_flush()

Since most platforms now use the same console_putc() and
console_flush(), move them to core/kernel/console.c. Make them __weak

core: add common implementation for console_putc() and console_flush()

Since most platforms now use the same console_putc() and
console_flush(), move them to core/kernel/console.c. Make them __weak
so that platforms may still provide their own.
The common code expects the platforms to initialize whatever serial
device from console_init() and call register_console().

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: convert sprd_uart driver to use struct serial_chip

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne

drivers: convert sprd_uart driver to use struct serial_chip

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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Add support for Spreadtrum SC9860(alias whale2) board

make PLATFORM=sprd-sc9860 [CFG_ARM64_core=y]

Signed-off-by: Aijun Sun <aijun.sun@spreadtrum.com>
Reviewed-by: Jerome Forissier <jerome.forissie

Add support for Spreadtrum SC9860(alias whale2) board

make PLATFORM=sprd-sc9860 [CFG_ARM64_core=y]

Signed-off-by: Aijun Sun <aijun.sun@spreadtrum.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>

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